[Expression] inconsistency between doc and implementation for 'int', 'float'

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Version

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Current main

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The document says ‘Return the floating point representation of the specified string or the string itself if conversion isn’t possible.’

https://docs.microsoft.com/en-us/azure/bot-service/adaptive-expressions/adaptive-expressions-prebuilt-functions?view=azure-bot-service-4.0#conversion-functions

However, if one uses int('bad'), float('bad'), it will throw an exception ‘Input string was not in a correct format.’

To Reproduce

Steps to reproduce the behavior:

1. See https://github.com/xieofxie/botbuilder-dotnet/commit/5084688a55c11b3749a85dbae9ca426bd33a14be

Expected behavior

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If exception is the planned behavior, we still need a function to know if a string is whether in int format (from document, we could int and then isInteger

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Additional context

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[xieofxie]

@emgrol Sure, hope the new functions could be added soon.

[Danieladu]

close this one due to the duplication of #4773