core/tracker: track blinded proposals

[gsora]

Do the same type casting we do in core/bcast to switch on the type of block proposal.

Add a test to check for this property.

category: bug ticket: none

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 46.42857% with 15 lines in your changes missing coverage. Please review.

Project coverage is 56.80%. Comparing base (80d55bc) to head (00f6385). Report is 1 commits behind head on main.

Files	Patch %	Lines
core/tracker/inclusion.go	46.42%	12 Missing and 3 partials :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #3149 +/- ## ========================================== - Coverage 56.86% 56.80% -0.06% ========================================== Files 208 208 Lines 29337 29356 +19 ========================================== - Hits 16683 16677 -6 - Misses 10815 10836 +21 - Partials 1839 1843 +4 ```

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[sonarcloud[bot]]

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 SonarCloud