Add Set support

[Havret]

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[Copilot]

Pull request overview

This PR adds support for ISet<T> collections to the RocksDb.Extensions library, mirroring the existing IList<T> functionality. The implementation refactors the existing list serializers by introducing base classes that can be shared between list and set serializers.

Key Changes:

• Introduced abstract base classes FixedSizeCollectionSerializer and VariableSizeCollectionSerializer for code reuse
• Created FixedSizeSetSerializer and VariableSizeSetSerializer for set-specific implementations
• Refactored existing list serializers to inherit from the new base classes
• Updated RocksDbBuilder to automatically create appropriate serializers for ISet<T> types
• Added comprehensive test coverage for set support across all serializer types

Reviewed changes

Copilot reviewed 12 out of 12 changed files in this pull request and generated 6 comments.

Show a summary per file

File	Description
src/RocksDb.Extensions/FixedSizeCollectionSerializer.cs	New abstract base class for serializing collections with fixed-size elements (primitives)
src/RocksDb.Extensions/VariableSizeCollectionSerializer.cs	New abstract base class for serializing collections with variable-size elements (strings, complex objects)
src/RocksDb.Extensions/FixedSizeSetSerializer.cs	Concrete implementation for serializing ISet with fixed-size elements
src/RocksDb.Extensions/VariableSizeSetSerializer.cs	Concrete implementation for serializing ISet with variable-size elements
src/RocksDb.Extensions/FixedSizeListSerializer.cs	Refactored to extend FixedSizeCollectionSerializer base class
src/RocksDb.Extensions/VariableSizeListSerializer.cs	Refactored to extend VariableSizeCollectionSerializer base class
src/RocksDb.Extensions/RocksDbBuilder.cs	Added logic to detect ISet types and create appropriate serializers (fixed vs variable size)
test/RocksDb.Extensions.Tests/RocksDbStoreWithProtobufSerializerTests.cs	Added test for set support with Protobuf serializer
test/RocksDb.Extensions.Tests/RocksDbStoreWithProtoBufNetSerializerTests.cs	Added test for set support with ProtoBufNet serializer
test/RocksDb.Extensions.Tests/RocksDbStoreWithPrimitiveSerializerTests.cs	Added tests for set support with primitive types (int and string)
test/RocksDb.Extensions.Tests/RocksDbStoreWithJsonSerializerTests.cs	Added test for set support with JSON serializer
README.md	Updated documentation to reflect ISet support alongside IList

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[Copilot]

Pull request overview

Copilot reviewed 12 out of 12 changed files in this pull request and generated no new comments.

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