adding tools.rs, add extract_i64

[samuelcolvin]

Selected Reviewer: @adriangb

[codspeed-hq]

CodSpeed Performance Report

Merging #635 tools (3193163) will not alter performances.

Summary

🔥 0 improvements
❌ 0 regressions
✅ 121 untouched benchmarks

🆕 0 new benchmarks
⁉️ 0 dropped benchmarks

[codecov-commenter]

Codecov Report

Merging #635 (fb694d0) into main (26fa27d) will increase coverage by 0.00%.
The diff coverage is 82.30%.

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Additional details and impacted files

@@           Coverage Diff           @@
##             main     #635   +/-   ##
=======================================
  Coverage   94.04%   94.05%           
=======================================
  Files          98       99    +1     
  Lines       13456    13466   +10     
  Branches       25       25           
=======================================
+ Hits        12655    12665   +10     
  Misses        795      795           
  Partials        6        6           

Impacted Files	Coverage Δ
src/argument_markers.rs	87.87% <ø> (ø)
src/lib.rs	100.00% <ø> (ø)
src/serializers/config.rs	93.75% <0.00%> (ø)
src/serializers/filter.rs	96.07% <ø> (ø)
src/serializers/type_serializers/definitions.rs	93.22% <ø> (ø)
src/serializers/type_serializers/dict.rs	95.55% <ø> (ø)
src/serializers/type_serializers/format.rs	91.11% <0.00%> (ø)
src/serializers/type_serializers/generator.rs	93.47% <ø> (ø)
src/serializers/type_serializers/json.rs	96.49% <ø> (ø)
src/serializers/type_serializers/json_or_python.rs	85.71% <ø> (ø)
... and 59 more

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[samuelcolvin]

please review.