Add thread context package for Lambda runtime interface client support

[RanVaknin]

This PR adds a new thread-context module that provides thread-local storage utilities for sharing data across components, specifically to support trace ID propagation.

Background

Previously, we implemented trace ID propagation using SLF4J's MDC in PR #6363, but this was
reverted because the MDC interface exists but the implementation is not provided by the SDK, Lambda runtime, or X-Ray SDK.

Solution

Added a small ThreadStorage utility class that provides thread local key value storage using ThreadLocal<Map<String, String>>. For this case, it allows the Lambda Runtime Interface Client, AWS SDK, and X-Ray SDK to share trace context via this one package, but can extended to other use cases.

Example:

ThreadStorage.put("some-value", foo);
String traceId = ThreadStorage.get("some-value");
ThreadStorage.remove("some-value");
ThreadStorage.clear();

[sonarqubecloud]

Quality Gate failed

Failed conditions
C Reliability Rating on New Code (required ≥ A)

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[github-actions]

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