feat(predictions):adds ssml support to polly integration

[elvinrowe]

Description of changes

• Adds optional textType property to TextToSpeechInput interface that can be set to either 'text' or 'ssml'.
• Updated the SynthesizeSpeech call so the TextType can be set by the textType property. TextType defaults to 'text' if textType property is undefined maintaining current functionality.

Issue #, if available

• 6075

Description of how you validated changes

• Ran change through a sample app

Checklist

• [x] PR description included
• [x] yarn test passes
• [ ] Tests are changed or added
• [ ] Relevant documentation is changed or added (and PR referenced)

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[codecov-commenter]

Codecov Report

:white_check_mark: All modified and coverable lines are covered by tests. :white_check_mark: Project coverage is 83.61%. Comparing base (eb73ad7) to head (c6d02f4). :warning: Report is 2932 commits behind head on main.

:x: Your changes status has failed because you have indirect coverage changes. Learn more about Unexpected Coverage Changes and reasons for indirect coverage changes.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #10007      +/-   ##
==========================================
- Coverage   83.62%   83.61%   -0.02%     
==========================================
  Files         253      253              
  Lines       18261    18262       +1     
  Branches     3918     3919       +1     
==========================================
- Hits        15271    15270       -1     
- Misses       2898     2900       +2     
  Partials       92       92              

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