chore: create plugin feature

Author: appflowy

README.md

@@ -18,6 +18,8 @@ abstraction for the collaborative features of AppFlowy. It exposes cohesive modu
 - Entity definitions and protobuf types under `collab::entity`.
 - Database, document, folder, importer, plugin, and user services under `collab::database`, `collab::document`,
   `collab::folder`, `collab::importer`, `collab::plugins`, and `collab::user`.
+- The plugin subsystem (`collab::plugins`) is guarded by the optional `plugins` Cargo feature; enable it when you
+  need local/remote persistence helpers.
 
 With everything consolidated, consumers only need to depend on the `collab` crate to access the full collaborative
 feature set.

collab/Cargo.toml

@@ -72,7 +72,7 @@ tracing-wasm = "0.2"
 [dev-dependencies]
 tokio = { workspace = true, features = ["macros", "sync", "rt"] }
 tempfile = "3.8.0"
-collab = { path = "", features = ["default"] }
+collab = { path = "", default-features = false }
 chrono.workspace = true
 assert-json-diff = "2.0.2"
 tracing-subscriber = { version = "0.3.3", features = ["env-filter"] }
@@ -83,16 +83,16 @@ tokio-test = "0.4"
 
 [features]
 default = []
+plugins = ["dep:rocksdb"]
 verbose_log = []
 trace_transact = []
 lock_timeout = []
 rwlock_reason = []
-postgres_plugin = ["rand"]
 import_csv = []
 
 [build-dependencies]
 prost-build = "0.12"
 protoc-bin-vendored = "3.0.0"
 
 [target.'cfg(not(target_arch = "wasm32"))'.dependencies]
-rocksdb = { version = "0.22.0", default-features = false, features = ["zstd"] }
+rocksdb = { version = "0.22.0", default-features = false, features = ["zstd"], optional = true }

collab/MERGE_TODO.md

@@ -44,8 +44,8 @@ highest-level consumers so that each merge simplifies the remaining ones.
 
 ### 2. Integrate `collab-plugins` (optional extensions)
 
-- [x] Relocate `collab-plugins/src` into `collab::plugins`, preserving feature
-      gates such as `postgres_plugin` and conditional `rocksdb`/WASM support.
+- [x] Relocate `collab-plugins/src` into `collab::plugins`, preserving
+      conditional `rocksdb`/WASM support.
 - [x] Merge any plugin-specific feature flags and dependencies (e.g.,
       `tokio-retry`, optional `rand`, `rocksdb`) into `collab/Cargo.toml`.
 - [x] Update `build.rs` or initialization hooks if plugins require runtime

collab/src/lib.rs

@@ -23,6 +23,7 @@ pub mod error;
 pub mod folder;
 pub mod importer;
 pub mod lock;
+#[cfg(feature = "plugins")]
 pub mod plugins;
 pub mod user;
 pub mod util;