refactor: flatten kvapi crate by removing redundant kvapi/ subdirectory

[drmingdrmer]

Changelog

refactor: flatten kvapi crate by removing redundant kvapi/ subdirectory

The kvapi crate had a redundant nesting layer where src/lib.rs declared
a single pub mod kvapi mapping to src/kvapi/mod.rs. This forced callers
to write databend_meta_kvapi::kvapi::Key instead of databend_meta_kvapi::Key.

All 15 source files are moved from src/kvapi/ to src/, and kvapi/mod.rs
is merged into lib.rs. Internal use crate::kvapi::X imports become
use crate::X; files that used the bare use crate::kvapi module alias
switch to use crate as kvapi to preserve unqualified kvapi::KVApi syntax
in trait bounds and impl blocks. External consumers follow the same pattern:
databend_meta_kvapi::kvapi::X → databend_meta_kvapi::X.

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• Improvement

[xp-trumpet]

@xp-trumpet partially reviewed 41 files and all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on drmingdrmer).

[Copilot]

Pull request overview

Flattens the databend-meta-kvapi crate’s module layout by removing the redundant kvapi/ nesting, and updates in-repo consumers to use the new top-level exports (e.g. databend_meta_kvapi::KVApi instead of databend_meta_kvapi::kvapi::KVApi).

Changes:

• Replace pub mod kvapi indirection with a flat crate root (src/lib.rs now declares modules and re-exports public API directly).
• Update imports across server/client crates and integration tests to the new databend_meta_kvapi::* paths (or use databend_meta_kvapi as kvapi where a kvapi::... qualifier is desired).
• Move previously nested items (e.g. message, list_options) to top-level modules and re-export them from the crate root.

Reviewed changes

Copilot reviewed 39 out of 41 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
crates/server/service/tests/it/meta_node/t90_time_revert_cross_snapshot_boundary.rs	Update KvApiExt import to new top-level path.
crates/server/service/tests/it/meta_node/meta_node_lifecycle.rs	Update KvApiExt import to new top-level path.
crates/server/service/tests/it/meta_node/meta_node_kv_api_expire.rs	Update KvApiExt import to new top-level path.
crates/server/service/tests/it/grpc/t53_metasrv_grpc_snapshot_keys_layout.rs	Update KvApiExt import to new top-level path.
crates/server/service/tests/it/grpc/metasrv_grpc_watch.rs	Update KvApiExt import to new top-level path.
crates/server/service/tests/it/grpc/metasrv_grpc_kv_transaction.rs	Update KvApiExt import to new top-level path.
crates/server/service/tests/it/grpc/metasrv_grpc_kv_read_v1.rs	Update KvApiExt import to new top-level path.
crates/server/service/tests/it/grpc/metasrv_grpc_kv_list.rs	Update KvApiExt import to new top-level path.
crates/server/service/tests/it/grpc/metasrv_grpc_kv_get_many.rs	Update KvApiExt import to new top-level path.
crates/server/service/tests/it/grpc/metasrv_grpc_kv_api_restart_cluster.rs	Update KvApiExt import to new top-level path.
crates/server/service/tests/it/grpc/metasrv_grpc_export.rs	Update KvApiExt import to new top-level path.
crates/server/service/tests/it/grpc/metasrv_grpc_api.rs	Update KvApiExt / UpsertKVReply imports to new top-level paths.
crates/server/service/tests/it/grpc/metasrv_connection_error.rs	Update KvApiExt import to new top-level path.
crates/server/service/src/meta_service/meta_leader.rs	Update KVApi, KvApiExt, ListOptions imports to new top-level paths.
crates/server/service/src/meta_node/meta_handle.rs	Update UpsertKVReply import to new top-level path.
crates/server/service/src/message.rs	Update request/reply type imports (GetKVReq, ListKVReq, etc.) to new top-level paths.
crates/server/raft-store/src/sm_v003/sm_v003_test.rs	Update KVApi / ListOptions imports to new top-level paths.
crates/server/raft-store/src/sm_v003/sm_v003_kv_api.rs	Switch to use databend_meta_kvapi as kvapi and update helper/type imports to top-level.
crates/client/kvapi/src/value_with_name.rs	Replace use crate::kvapi with use crate as kvapi after flattening.
crates/client/kvapi/src/value.rs	Replace use crate::kvapi with use crate as kvapi after flattening.
crates/client/kvapi/src/testing.rs	Update intra-crate imports to flattened module layout.
crates/client/kvapi/src/pair.rs	Replace use crate::kvapi with use crate as kvapi after flattening.
crates/client/kvapi/src/message.rs	New top-level message/request/reply types module (moved out of nested kvapi/).
crates/client/kvapi/src/list_options.rs	New top-level ListOptions module (moved out of nested kvapi/).
crates/client/kvapi/src/lib.rs	Replace pub mod kvapi; with direct module declarations + pub use re-exports.
crates/client/kvapi/src/kvapi/mod.rs	Remove old nested kvapi module root.
crates/client/kvapi/src/kv_api_ext.rs	Update imports and test module to flattened paths.
crates/client/kvapi/src/key_parser.rs	Update helper/type imports to flattened module layout.
crates/client/kvapi/src/key_codec.rs	Update imports to flattened module layout.
crates/client/kvapi/src/key_builder.rs	Update helper imports and test import paths to flattened module layout.
crates/client/kvapi/src/key.rs	Update imports and test imports to flattened module layout.
crates/client/kvapi/src/item.rs	Update Key import to new top-level path.
crates/client/kvapi/src/helper.rs	Update KeyError import to new top-level path.
crates/client/kvapi/src/dir_name.rs	Update imports and test imports to flattened module layout.
crates/client/kvapi/src/api.rs	Update ListOptions import and keep kvapi::KVApi naming via use crate as kvapi.
crates/client/kvapi-tests/tests/it/metasrv_builder.rs	Switch to use databend_meta_kvapi as kvapi alias.
crates/client/kvapi-test-suite/src/kvapi_test_suite.rs	Switch to use databend_meta_kvapi as kvapi alias; update KVStream import.
crates/client/client/tests/it/grpc_client.rs	Update KvApiExt import to new top-level path.
crates/client/client/src/kvapi_impl.rs	Switch to use databend_meta_kvapi as kvapi alias and update helper/type imports.
crates/client/client/src/grpc_client.rs	Update fail_fast import to new top-level path.
crates/client/client/src/client_handle.rs	Update KVStream return type to new top-level path.

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