chore: many refactor with breaking api changes

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[Copilot]

Pull request overview

This PR introduces significant refactoring with breaking API changes, including:

• Migration from rlp to alloy-rlp for RLP encoding/decoding
• Introduction of lifetime parameters and Cow types for zero-copy optimizations
• Refactored error handling with a new Response enum and RpcError type
• Simplified version handling by moving version initialization to build-time
• Reorganized configuration with suppress_empty_task_error moved from ProverConfig to CoordinatorConfig

Key Changes

• Enhanced type safety with derive macros (EnumIs, FromRepr, Display) replacing manual implementations
• Improved token management using OnceCell and Arc for concurrent access
• Consolidated API request handling into a single generic request method

Reviewed changes

Copilot reviewed 15 out of 16 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
src/utils.rs	Replaced runtime version initialization with compile-time constant using env! macros
src/prover/types.rs	Migrated to derive macros and alloy-rlp for enum serialization
src/prover/mod.rs	Removed test module, refactored task retrieval logic, updated to use Cow types
src/prover/builder.rs	Updated to pass suppress_empty_task_error to coordinator client
src/coordinator_handler/types.rs	Complete refactor of response handling and type definitions with zero-copy optimizations
src/coordinator_handler/key_signer.rs	Minor import reordering
src/coordinator_handler/error.rs	Renamed error variants and added EnumIs derive
src/coordinator_handler/coordinator_client.rs	Refactored token management and error handling
src/coordinator_handler/api.rs	Consolidated request methods into generic request function
src/config.rs	Moved suppress_empty_task_error field to CoordinatorConfig
rust-toolchain.toml	Updated nightly channel version
examples/local.rs	Import reordering
examples/cloud.rs	Import reordering
build.rs	New file for build-time environment variable setup
Cargo.toml	Updated version, edition, and dependencies

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