fix(spec): Always start propose timeout

[josef-widder]

This is the simple part for #81 to start timeoutPropose also at the Proposer.

The GetValue logic (adding consensus inputs and outputs and actions) will be done in another PR once #154, #156, and this PR are merged.

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PR author checklist

• Reference GitHub issue
• Ensure PR title follows the conventional commits spec

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (e122983) 91.93% compared to head (8ac3caf) 91.93%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #157   +/-   ##
=======================================
  Coverage   91.93%   91.93%           
=======================================
  Files          33       33           
  Lines        1884     1884           
=======================================
  Hits         1732     1732           
  Misses        152      152           

Flag	Coverage Δ
integration	90.01% <ø> (ø)
mbt	47.41% <ø> (ø)

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[josef-widder]

I close it as this will need to change again with the getValue logic.