feat: force parser v2 with devtools flag

[hugo-stacks]

This PR forces the use of the parser v2 when the devtools cargo feature flag is enabled.
This feature flag is also used to enable directly calling private_function.
Clarinet has been forcing parser v2 for the past ~3 years by forcing contract the epoch on contracts to be >= 2.1. But it has a few unwanted side effects.

This will eventually become unnecessary when we are able to merge #3662, but for now, the block validation is failing.

By adding this check here with the feature flag, we'll be able to remove the epoch hack in Clarinet.

[brice-stacks]

This looks good, thanks! I just commented on one little nit about the style used for the feature-gating.

[federico-stacks]

Heads up: I allowed the CI workflow execution, and it surfaced a Rust formatting issue.

[hugo-stacks]

Thanks @federico-stacks, that should be good

[federico-stacks]

clippy issue this time :)

You probably already know, but just in case: you can save some time by running these locally to check formatting and clippy warnings:

• cargo fmt-stacks
• cargo clippy-stacks

(dnd current rust version is 1.92.0)

[hugo-stacks]

Yeah clippy was already complaining after the first commit/ And I made it worse in the second commit (completely broke it). Should be good now

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 69.06%. Comparing base (4f535d8) to head (f09f924).
⚠️ Report is 8 commits behind head on develop.

❌ Your project status has failed because the head coverage (69.06%) is below the target coverage (80.00%). You can increase the head coverage or adjust the target coverage.

❗ There is a different number of reports uploaded between BASE (4f535d8) and HEAD (f09f924). Click for more details.

HEAD has 16 uploads less than BASE

Flag	BASE (4f535d8)	HEAD (f09f924)
	82	66

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #6764      +/-   ##
===========================================
- Coverage    77.77%   69.06%   -8.72%     
===========================================
  Files          585      585              
  Lines       361916   361918       +2     
===========================================
- Hits        281498   249941   -31557     
- Misses       80418   111977   +31559     

Files with missing lines	Coverage Δ
clarity/src/vm/ast/mod.rs	70.50% <100.00%> (-10.16%)	⬇️

... and 339 files with indirect coverage changes

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[brice-stacks]

👍

[github-actions]

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