refactor builders

[Geal]

This splits the builder.rs file in multiple files

[codspeed-hq]

CodSpeed Performance Report

Merging #249 will not alter performance

_{Comparing geal/refactor-builders (21d3ad6) with v5 (255abf2)}

Summary

✅ 12 untouched benchmarks

[codecov]

Codecov Report

Attention: Patch coverage is 74.38541% with 323 lines in your changes missing coverage. Please review.

Project coverage is 65.64%. Comparing base (255abf2) to head (21d3ad6).
Report is 1 commits behind head on v5.

Files with missing lines	Patch %	Lines
biscuit-auth/src/token/builder/block.rs	60.71%	77 Missing ⚠️
biscuit-auth/src/token/builder/term.rs	74.57%	75 Missing ⚠️
biscuit-auth/src/token/builder/rule.rs	75.23%	53 Missing ⚠️
biscuit-auth/src/token/builder/expression.rs	82.75%	30 Missing ⚠️
biscuit-auth/src/token/builder/biscuit.rs	67.16%	22 Missing ⚠️
biscuit-auth/src/token/builder/algorithm.rs	15.00%	17 Missing ⚠️
biscuit-auth/src/token/builder/fact.rs	78.75%	17 Missing ⚠️
biscuit-auth/src/token/builder/check.rs	88.04%	11 Missing ⚠️
biscuit-auth/src/token/builder/policy.rs	85.29%	10 Missing ⚠️
biscuit-auth/src/token/builder/scope.rs	71.42%	8 Missing ⚠️
... and 2 more

Additional details and impacted files

@@            Coverage Diff             @@
##               v5     #249      +/-   ##
==========================================
- Coverage   65.65%   65.64%   -0.01%     
==========================================
  Files          27       38      +11     
  Lines        6994     6995       +1     
==========================================
  Hits         4592     4592              
- Misses       2402     2403       +1     

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