*: consensus abstraction

[pinebit]

Summary of changes:

1. Introduced & implemented ConsensusController interface.
2. Refactored the entire consensus package with increased test coverage.
3. Added cluster run --consensus-protocol=xyz flag.
4. Wired Priority protocol to change the current core consensus algorithm.
5. Support to run two consensus protocols at a time (one for Priority - QBFT and another is for Core).
6. Added docs/consensus.md

category: feature ticket: #3304

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 74.13333% with 97 lines in your changes missing coverage. Please review.

Project coverage is 58.82%. Comparing base (774902f) to head (078de38). Report is 4 commits behind head on main.

Files with missing lines	Patch %	Lines
app/app.go	0.00%	41 Missing :warning:
core/consensus/controller.go	67.44%	10 Missing and 4 partials :warning:
core/consensus/qbft/qbft.go	76.36%	12 Missing and 1 partial :warning:
core/corepb/v1/consensus.pb.go	40.00%	9 Missing :warning:
core/consensus/qbft/transport.go	73.07%	7 Missing :warning:
core/consensus/qbft/msg.go	70.00%	6 Missing :warning:
cluster/manifestpb/v1/manifest.pb.go	0.00%	5 Missing :warning:
core/deadline.go	66.66%	2 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #3327 +/- ## ========================================== + Coverage 58.68% 58.82% +0.14% ========================================== Files 210 216 +6 Lines 30290 30449 +159 ========================================== + Hits 17777 17913 +136 - Misses 10621 10636 +15 - Partials 1892 1900 +8 ```

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[pinebit]

Added @OisinKyne to review at least:

• docs/consensus.md
• CLI flags
• Metrics changes

[sonarcloud[bot]]

Quality Gate passed

Issues
15 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.9% Duplication on New Code

See analysis details on SonarCloud