fix: [#4007] Bot framework V4. Unable to use ⭐ emoji in suggested actions

[ceciliaavila]

Fixes #4007

Description

This PR ports the changes in dotnet PR#4671 to add the findExactMatch function in botbuilder-dialogs/choices to check for exact matches and bypass the tokenizer logic if an exact match is found.

Specific Changes

• Updated findValues class to check for exact matches and bypass the rest of its logic if an exact match is found.
• Added a test to account for situations where multiple choices have the same word characters but different non-word characters.

Testing

These images show the star choice being ignored, and after the fix, being properly recognized.

[coveralls]

Pull Request Test Coverage Report for Build 1602553546

• 7 of 7 (100.0%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.002%) to 84.545%

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Totals
Change from base Build 1594509170:	0.002%
Covered Lines:	19667
Relevant Lines:	22035

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💛 - Coveralls