*: 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]

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 ⚠️
core/consensus/controller.go	67.44%	10 Missing and 4 partials ⚠️
core/consensus/qbft/qbft.go	76.36%	12 Missing and 1 partial ⚠️
core/corepb/v1/consensus.pb.go	40.00%	9 Missing ⚠️
core/consensus/qbft/transport.go	73.07%	7 Missing ⚠️
core/consensus/qbft/msg.go	70.00%	6 Missing ⚠️
cluster/manifestpb/v1/manifest.pb.go	0.00%	5 Missing ⚠️
core/deadline.go	66.66%	2 Missing ⚠️

Additional details and impacted files

@@            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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[gsora]

Mostly minor comments, generally looks great

[pinebit]

Added @OisinKyne to review at least:

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

[sonarcloud]

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