[csolution-rpc] Handle content-length header CRLF line endings for LSP compliance

[grasci-arm]

Compliant to https://microsoft.github.io/language-server-protocol/specifications/lsp/3.17/specification/#baseProtocol

Add CrossPlatformUtils::Crlf(): overcomes the automatic translation from \n into \r\n when using std::cout on Windows.

[github-actions]

Test Results

 33 files   66 suites   9s ⏱️
164 tests 164 ✅ 0 💤 0 ❌
492 runs  492 ✅ 0 💤 0 ❌

Results for commit 248e788.

♻️ This comment has been updated with latest results.

[codecov]

Codecov Report

Attention: Patch coverage is 80.00000% with 6 lines in your changes missing coverage. Please review.

Project coverage is 65.79%. Comparing base (eda99da) to head (248e788).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
tools/projmgr/test/src/ProjMgrRpcTests.cpp	84.00%	0 Missing and 4 partials ⚠️
tools/projmgr/src/ProjMgrRpcServer.cpp	60.00%	0 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2122      +/-   ##
==========================================
+ Coverage   65.74%   65.79%   +0.04%     
==========================================
  Files         181      181              
  Lines       37039    37067      +28     
  Branches    21533    21553      +20     
==========================================
+ Hits        24352    24388      +36     
+ Misses       8273     8261      -12     
- Partials     4414     4418       +4     

Flag	Coverage Δ
buildmgr-cov	73.95% <ø> (ø)
packgen-cov	77.87% <ø> (ø)
projmgr-cov	80.05% <80.00%> (+0.09%)	⬆️

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

Files with missing lines	Coverage Δ
tools/projmgr/include/ProjMgrRpcServer.h	75.00% <ø> (ø)
tools/projmgr/src/ProjMgrRpcServer.cpp	29.76% <60.00%> (+5.66%)	⬆️
tools/projmgr/test/src/ProjMgrRpcTests.cpp	82.43% <84.00%> (+0.79%)	⬆️

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