[projmgr] Add ConvertSolution, update LoadSolution and GetVersion RPC methods

[grasci-arm]

Address Open-CMSIS-Pack/cmsis-toolbox#406
Start addressing Open-CMSIS-Pack/cmsis-toolbox#408

• Handle LoadSolution method request with activeTarget parameter
• Add apiVersion to GetVersion method response
• AddConvertSolution method handling

[github-actions]

Test Results

    3 files     21 suites   14m 9s ⏱️
  421 tests   421 ✅ 0 💤 0 ❌
1 263 runs  1 263 ✅ 0 💤 0 ❌

Results for commit 09ee3c3.

[codecov]

Codecov Report

❌ Patch coverage is 82.10526% with 17 lines in your changes missing coverage. Please review.
✅ Project coverage is 66.61%. Comparing base (0709443) to head (09ee3c3).
⚠️ Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
tools/projmgr/test/src/ProjMgrRpcTests.cpp	66.66%	0 Missing and 14 partials ⚠️
tools/projmgr/src/ProjMgrRpcServer.cpp	86.36%	2 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2187      +/-   ##
==========================================
+ Coverage   66.60%   66.61%   +0.01%     
==========================================
  Files         181      181              
  Lines       38417    38476      +59     
  Branches    22511    22556      +45     
==========================================
+ Hits        25586    25632      +46     
- Misses       8080     8081       +1     
- Partials     4751     4763      +12     

Flag	Coverage Δ
projmgr-cov	80.76% <82.10%> (-0.02%)	⬇️

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

Files with missing lines	Coverage Δ
tools/projmgr/include/ProjMgr.h	100.00% <ø> (ø)
tools/projmgr/src/ProjMgr.cpp	80.37% <100.00%> (+0.17%)	⬆️
tools/projmgr/test/src/ProjMgrTestEnv.cpp	76.76% <100.00%> (+2.46%)	⬆️
tools/projmgr/test/src/ProjMgrUnitTests.cpp	80.28% <ø> (-0.07%)	⬇️
tools/projmgr/src/ProjMgrRpcServer.cpp	67.04% <86.36%> (+0.84%)	⬆️
tools/projmgr/test/src/ProjMgrRpcTests.cpp	56.18% <66.66%> (+0.13%)	⬆️

... and 1 file with indirect coverage changes

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