Activate signer state machine by upgrading SUPPORTED_SIGNER_PROTOCOL_VERSION to 2

[jferrant]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 81.83%. Comparing base (1f086cd) to head (929302c).
⚠️ Report is 1285 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff              @@
##           develop    #6281       +/-   ##
============================================
+ Coverage    54.77%   81.83%   +27.05%     
============================================
  Files          541      541               
  Lines       347771   347771               
============================================
+ Hits        190508   284583    +94075     
+ Misses      157263    63188    -94075     

Files with missing lines	Coverage Δ
stacks-signer/src/v0/signer_state.rs	77.19% <ø> (+5.50%)	⬆️

... and 422 files with indirect coverage changes

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