Remove deprecated exports

[connor-baer]

Relates to #126.

Approach and changes

• Removed the deprecated format, formatToParts, resolveFormat, and isIntlSupported exports. Use the explicitly named formatNumber, formatNumberToParts, resolveNumberFormat, and isNumberFormatSupported exports instead.

Definition of done

• Development completed
• Reviewers assigned
• Unit and integration tests
• Meets minimum browser support
• Meets accessibility requirements

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 93.22%. Comparing base (6b8dc64) to head (a94ae17).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #252      +/-   ##
==========================================
- Coverage   93.26%   93.22%   -0.05%     
==========================================
  Files          15       15              
  Lines         668      664       -4     
  Branches       84       84              
==========================================
- Hits          623      619       -4     
  Misses         43       43              
  Partials        2        2              

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