Fixed the DtoGenerator to support multi projects

[baoduy]

This pull request introduces a few project configuration changes to improve testability and packaging for the EfCore.DtoGenerator project. The most significant updates involve making the GenerateDtoAttribute internal, exposing internals for testing, and refining project references for test projects.

Testability improvements:

• Added InternalsVisibleTo in DKNet.EfCore.DtoGenerator.csproj to allow the EfCore.DtoGenerator.Tests project to access internal members, facilitating more thorough unit testing.
• Changed GenerateDtoAttribute from public to internal, restricting its visibility to within the assembly and friend assemblies.

Test project reference configuration:

• Updated the test project reference in EfCore.DtoGenerator.Tests.csproj to include PrivateAssets and IncludeAssets, ensuring proper analyzer and asset handling during test builds.

Packaging adjustments:

• Enabled packaging of the analyzer DLL and attribute source file in the NuGet package by uncommenting relevant <None Include=... Pack="true" ... /> entries in DKNet.EfCore.DtoGenerator.csproj.

IDE/test session state:

• Minor changes to the .DotSettings.user file, updating the active state of test sessions (no impact on code or build).

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 84.61%. Comparing base (c9416b4) to head (d5b7459).
⚠️ Report is 6 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #282   +/-   ##
=======================================
  Coverage   84.61%   84.61%           
=======================================
  Files         159      159           
  Lines        3653     3653           
  Branches      568      568           
=======================================
  Hits         3091     3091           
  Misses        405      405           
  Partials      157      157           

Flag	Coverage Δ
unittests	84.61% <ø> (ø)

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[github-actions]

📊 Code Coverage Report

| Metric | Coverage |
|--------|----------|
| **Line Coverage** | 87.8% |
| **Branch Coverage** | 82.2% |
| **Method Coverage** | 86% |

**Lines:** 3208/undefined covered
**Branches:** 1220/undefined covered

📈 [View Full Coverage Report](https://github.com/baoduy/DKNet/actions/runs/23624919159)