[Exporter.Geneva] Add httpUrl for HTTP server spans

[xiang17]

Fixes #
Design discussion issue #

Changes

Please provide a brief description of the changes here.

HTTP semconv: Combination of url.scheme, server.address, server.port, url.path and url.query attributes for HTTP server spans.

Merge requirement checklist

• CONTRIBUTING guidelines followed (license requirements, nullable enabled, static analysis, etc.)
• Unit tests added/updated
• Appropriate CHANGELOG.md files updated for non-trivial changes
• Changes in public API reviewed (if applicable)

[codecov]

Codecov Report

Attention: Patch coverage is 98.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 53.93%. Comparing base (71655ce) to head (7333b72).
Report is 874 commits behind head on main.

✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
...er.Geneva/Internal/MsgPack/MsgPackTraceExporter.cs	98.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #2818       +/-   ##
===========================================
- Coverage   73.91%   53.93%   -19.98%     
===========================================
  Files         267       55      -212     
  Lines        9615     5141     -4474     
===========================================
- Hits         7107     2773     -4334     
+ Misses       2508     2368      -140     

Flag	Coverage Δ
unittests-Exporter.Geneva	53.93% <98.00%> (?)

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
...er.Geneva/Internal/MsgPack/MsgPackTraceExporter.cs	93.65% <98.00%> (ø)

... and 251 files with indirect coverage changes

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[Copilot]

Pull Request Overview

This PR adds support for composing an httpUrl for HTTP server spans by combining multiple HTTP semantic convention attributes. Key changes include adding unit tests for HTTP URL composition in both unstable and stable semantic convention scenarios, updating Geneva exporter tests, and extending the MsgPackTraceExporter to cache and build the HTTP URL based on new mappings.

Reviewed Changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated no comments.

File	Description
test/OpenTelemetry.Exporter.Geneva.Tests/MsgPackTraceExporterTests.cs	Tests validating httpUrl parts caching and URL generation
test/OpenTelemetry.Exporter.Geneva.Tests/GenevaTraceExporterTests.cs	Integration tests for verifying HTTP URL mapping in server and client spans
src/OpenTelemetry.Exporter.Geneva/Internal/MsgPack/MsgPackTraceExporter.cs	Updates to caching mechanisms and HTTP URL composition logic using new mapping dictionaries
src/OpenTelemetry.Exporter.Geneva/CHANGELOG.md	Changelog updated with new HTTP URL mapping feature

Comments suppressed due to low confidence (2)

src/OpenTelemetry.Exporter.Geneva/Internal/MsgPack/MsgPackTraceExporter.cs:489

• [nitpick] Consider renaming the variable 'httpMethodString' (assigned at this point) to 'httpMethodTagKey' to more explicitly indicate that it holds the tag key rather than the HTTP method value.

if (isServerActivity && replacementKey == "httpMethod")

src/OpenTelemetry.Exporter.Geneva/Internal/MsgPack/MsgPackTraceExporter.cs:462

• [nitpick] Consider adding an inline comment here to clarify the initialization and reset behavior of the 'HttpUrlParts' thread-local variable to improve code maintainability.

var httpUrlParts = this.HttpUrlParts.Value ?? new object?[CS40_PART_B_HTTPURL_MAPPING.Count];

[rajkumar-rangaraj]

LGTM, there is a minor style error please fix it.