CCIP-021: Extend Direct Execution Sunset Period

[friedger]

This PR

• implements CCIP-021 defined at CCIP-021: Extend Direct Execution Sunset Period - 2 governance#31

[whoabuddy]

Found a few things but overall looks great, thank you!

[whoabuddy]

Also see the change in #70 to pin the Clarinet version so the tests pass :)

[codecov]

Codecov Report

Attention: Patch coverage is 96.80851% with 3 lines in your changes are missing coverage. Please review.

Project coverage is 88.86%. Comparing base (27a0c8f) to head (01b13a2).

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #69      +/-   ##
==========================================
+ Coverage   88.27%   88.86%   +0.59%     
==========================================
  Files          20       21       +1     
  Lines        1262     1356      +94     
  Branches      188      206      +18     
==========================================
+ Hits         1114     1205      +91     
  Misses        137      137              
- Partials       11       14       +3     

Files	Coverage Δ
...acts/proposals/ccip021-extend-sunset-period-2.clar	96.80% <96.80%> (ø)

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