feat: FileInput and FileTokenGroup

[katiegeorge]

Description

Related links, issue #, if available: n/a

How has this been tested?

Review checklist

The following items are to be evaluated by the author(s) and the reviewer(s).

Correctness

• Changes include appropriate documentation updates.
• Changes are backward-compatible if not indicated, see CONTRIBUTING.md.
• Changes do not include unsupported browser features, see CONTRIBUTING.md.
• Changes were manually tested for accessibility, see accessibility guidelines.

Security

• If the code handles URLs: all URLs are validated through the checkSafeUrl function.

Testing

• Changes are covered with new/existing unit tests?
• Changes are covered with new/existing integration tests?

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[codecov]

Codecov Report

Attention: Patch coverage is 90.36145% with 16 lines in your changes missing coverage. Please review.

Project coverage is 96.17%. Comparing base (35a8b43) to head (1552057).
Report is 27 commits behind head on main.

Files with missing lines	Patch %	Lines
src/file-token-group/default-formatters.ts	64.28%	3 Missing and 2 partials ⚠️
src/file-input/internal.tsx	87.50%	4 Missing ⚠️
src/test-utils/dom/file-token-group/index.ts	85.71%	4 Missing ⚠️
src/file-token-group/file-token.tsx	85.71%	3 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff            @@
##             main    #2846    +/-   ##
========================================
  Coverage   96.17%   96.17%            
========================================
  Files         759      767     +8     
  Lines       21364    21518   +154     
  Branches     7307     7341    +34     
========================================
+ Hits        20547    20696   +149     
- Misses        763      767     +4     
- Partials       54       55     +1     

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