Updated CompositeByteBuf to be responsible for retaining its ByteBufs

[rozza]

• Updated NettyByteBuf so that it does its own reference counting as the internals of Netty can also retain and release the netty ByteBuf implementation.
• Updated CommandMessage as CompositeByteBuf handles the releasing of its ByteBufs
• Migrated CompositeByteBufSpecification to JUnit 5 and added extra test cases with mixed ByteBuf types not just NIO ones.
• Added recording to CommandHelperSpecification as this caught the initial use of Netty doing its own accounting on its ByteBuf implementations.

JAVA-5982

[Copilot]

Pull Request Overview

This PR updates CompositeByteBuf to take responsibility for managing the reference counting lifecycle of its constituent ByteBuf components, rather than relying on external callers to handle this.

• Updated NettyByteBuf to maintain its own reference count separate from the underlying Netty buffer
• Modified CompositeByteBuf to retain/release component buffers during its own lifecycle management
• Migrated test suite from Groovy/Spock to JUnit 5 with enhanced coverage for mixed buffer types

Reviewed Changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
CompositeByteBufTest.java	New JUnit 5 test suite with parameterized tests for ByteBufNIO, NettyByteBuf, and mixed buffer scenarios
CompositeByteBufSpecification.groovy	Removed legacy Groovy/Spock test file being replaced by JUnit 5 version
CommandHelperSpecification.groovy	Added recording configuration to enable proper implementation logging
NettyByteBuf.java	Implemented independent reference counting with AtomicInteger to track buffer lifecycle
CompositeByteBuf.java	Updated to retain/release component buffers and duplicate them properly in copy constructor
CommandMessage.java	Simplified buffer management by removing manual release of byte buffers

Comments suppressed due to low confidence (2)

driver-core/src/test/unit/com/mongodb/internal/connection/CompositeByteBufTest.java:1

• The comment in line 246 says 'accross' but should be 'across'.

/*

driver-core/src/test/unit/com/mongodb/internal/connection/CompositeByteBufTest.java:1

• The comment in line 280 says 'accross' but should be 'across'.

/*

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