Add RawBody to RequestInfo for non-text payload validation

[dennisdoomen]

Summary

Add raw request body bytes to RequestInfo and CapturedRequest so non-text payloads can be validated.

Changes

• add RequestInfo.RawBody and a constructor overload accepting raw bytes
• derive textual Body from prefetched bytes for textual media types to avoid dual payload sources
• prefetch request content as bytes in HttpMock
• expose CapturedRequest.RawBody
• keep unexpected-request diagnostics consistent for binary payloads
• add/adjust specs for textual, binary, and PrefetchBody = false scenarios
• update API approval baselines for
  et8.0 and
  et472

Closes #156

[github-actions]

Test Results

  3 files  ±0    3 suites  ±0   10s ⏱️ -1s
196 tests +3  196 ✅ +3  0 💤 ±0  0 ❌ ±0 
389 runs  +6  389 ✅ +6  0 💤 ±0  0 ❌ ±0 

Results for commit dcd88cd. ± Comparison against base commit 2c610f2.

This pull request removes 1 and adds 4 tests. Note that renamed tests count towards both.

Mockly.Specs.HttpMockSpecs+SequencedResponses ‑ The_Responder_property_still_exposes_the_first_response

Mockly.Specs.HttpMockSpecs+SequencedResponses ‑ The_responder_property_still_exposes_the_first_response
Mockly.Specs.HttpMockSpecs+WhenCollectingRequests ‑ Exposes_the_raw_bytes_of_a_binary_captured_request
Mockly.Specs.HttpMockSpecs+WhenCollectingRequests ‑ Exposes_the_textual_body_of_a_captured_request
Mockly.Specs.HttpMockSpecs+WhenUsingAsyncResponders ‑ An_async_responder_receives_binary_request_body_as_raw_bytes

♻️ This comment has been updated with latest results.

[coveralls]

Coverage Report for CI Build 28732059354

Coverage increased (+0.1%) to 84.789%

Details

• Coverage increased (+0.1%) from the base build.
• Patch coverage: 3 uncovered changes across 1 file (34 of 37 lines covered, 91.89%).
• No coverage regressions found.

Uncovered Changes

File	Changed	Covered	%
Mockly/RequestInfo.cs	27	24	88.89%
Total (5 files)	37	34	91.89%

Coverage Regressions

No coverage regressions found.

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Coverage Stats

Relevant Lines:	1501
Covered Lines:	1341
Line Coverage:	89.34%
Relevant Branches:	491
Covered Branches:	348
Branch Coverage:	70.88%
Branches in Coverage %:	Yes
Coverage Strength:	338.4 hits per line

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💛 - Coveralls