feat: Add setSelectionRange to PromptInput

[gethinwebster]

Description

Add setSelectionRange to PromptInput

Related links, issue #, if available: AWSUI-60374

How has this been tested?

New unit test

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

All modified and coverable lines are covered by tests ✅

Project coverage is 96.41%. Comparing base (e389b28) to head (b650771).
Report is 3 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff            @@
##             main    #3294    +/-   ##
========================================
  Coverage   96.41%   96.41%            
========================================
  Files         791      791            
  Lines       22564    22566     +2     
  Branches     7727     7381   -346     
========================================
+ Hits        21756    21758     +2     
- Misses        754      801    +47     
+ Partials       54        7    -47     

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