✨ Add support for string-unit on object/anything arbitrary

[dubzzz]

Description

The unit field has been added pretty recently to string in order to offer ways for our users to control in a more granular way what kind of "character" they would like to be generated for their strings. In order not to mix "character" with the characters in JavaScript and to allow any feasible grapheme or combination of code-points to be a valid "character" we refer to them as "unit".

This PR adds supports for units of strings from object builders.

Checklist — Don't delete this checklist and make sure you do the following before opening the PR

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• My PR references one of several related issues (if any)
  • New features or breaking changes must come with an associated Issue or Discussion
  • My PR does not add any new dependency without an associated Issue or Discussion
• My PR includes bumps details, please run yarn bump and flag the impacts properly
• My PR adds relevant tests and they would have failed without my PR (when applicable)

Advanced

• Category: ✨ Introduce new features
• Impacts: New flags for finer control on some arbitraries

[changeset-bot]

🦋 Changeset detected

Latest commit: bd0c1fb

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
fast-check	Minor

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[github-actions]

👋 A preview of the new documentation is available at: http://671bce9d0a7e7c802fb1b966--dubzzz-fast-check.netlify.app

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.29%. Comparing base (0777214) to head (bd0c1fb).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #5366   +/-   ##
=======================================
  Coverage   95.29%   95.29%           
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  Files         234      234           
  Lines       10433    10433           
  Branches     2778     2778           
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  Hits         9942     9942           
  Misses        491      491           

Flag	Coverage Δ
unit-tests	95.29% <100.00%> (ø)
unit-tests-18.x-Linux	95.29% <100.00%> (ø)
unit-tests-20.x-Linux	95.29% <100.00%> (ø)
unit-tests-22.x-Linux	95.29% <100.00%> (ø)
unit-tests-latest-Linux	95.29% <100.00%> (ø)

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