More custom codecs

[ksysoev]

This pull request refactors the codec implementation to support multiple serialization formats and organizes codecs into their own packages. It removes the built-in JSON codec from the main package, introduces a modular codec structure for JSON, BSON, Gob, and MessagePack, and adds comprehensive tests for each codec. The changes improve extensibility and maintainability, making it easier to add or swap codecs.

Codec modularization and new codec support:

• Moved the JSON codec implementation from the main anycache package into a new codec/json package, updating all usages and tests accordingly. [1] [2] [3] [4] [5] [6] [7] [8] [9]
• Added new codec packages: codec/bson for BSON encoding/decoding (MongoDB), codec/gob for Go's native Gob encoding, and codec/msgpack for MessagePack serialization, each with their own implementation and test files. [1] [2] [3] [4] [5] [6]

Code cleanup and refactoring:

• Removed the original JSONCodec implementation from the main codec.go file, leaving only the Codec interface definition.
• Renamed the original codec test file to codec/json/json_test.go and updated it to use the new package structure.

Dependency updates:

• Added dependencies for BSON and MessagePack codecs in go.mod, and updated the klauspost/compress dependency version. [1] [2]

[codecov]

Codecov Report

❌ Patch coverage is 90.90909% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 89.20%. Comparing base (060a63c) to head (01e08d1).

Files with missing lines	Patch %	Lines
codec/gob/gob.go	77.77%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #94      +/-   ##
==========================================
- Coverage   89.23%   89.20%   -0.04%     
==========================================
  Files          10       13       +3     
  Lines         511      528      +17     
==========================================
+ Hits          456      471      +15     
- Misses         32       33       +1     
- Partials       23       24       +1     

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[Copilot]

Pull request overview

This PR modularizes anycache’s serialization layer by moving the JSON codec out of the root package and adding additional codec implementations (BSON, Gob, MessagePack) as dedicated subpackages under codec/, improving extensibility for swapping/adding codecs.

Changes:

• Moved the JSON codec implementation into codec/json and updated the cache default + tests to use it.
• Added new codec packages (codec/bson, codec/gob, codec/msgpack) with corresponding unit tests.
• Updated module dependencies to support the new codec implementations and refreshed documentation text.

Reviewed changes

Copilot reviewed 13 out of 14 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
README.md	Updates option documentation to mention available codecs.
go.mod	Adds/updates dependencies required for BSON and MessagePack support.
go.sum	Records checksums for newly introduced/updated transitive dependencies.
codec.go	Leaves only the Codec interface in the root package (removes old JSON implementation).
anycache.go	Switches the default codec to codec/json.
cache_options_test.go	Updates tests to use codec/json instead of the removed root JSON codec.
codec/json/json.go	Introduces JSON codec implementation in its own package.
codec/json/json_test.go	Moves/updates JSON codec tests for the new package.
codec/bson/bson.go	Adds BSON codec implementation.
codec/bson/bson_test.go	Adds BSON codec tests.
codec/gob/gob.go	Adds Gob codec implementation.
codec/gob/gob_test.go	Adds Gob codec tests.
codec/msgpack/msgpack.go	Adds MessagePack codec implementation.
codec/msgpack/msgpack_test.go	Adds MessagePack codec tests.

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