The changes in [Expression]Add stringOrValue built-in function (#5138) may need to be ported to maintain parity with microsoft/botbuilder-dotnet.

Fixes #5009

Description

Introduce a new built-in function that refers to smart interpolation.

The original requirements are:

• when user input is a simple variable, like ${name} or ${age}, it should evaluate as a single variable and the return type is the variable type (int\float\string, it could vary)
• when user input is text + variables, like ${age} is too big, it should evaluate as a string intepolation, and always return a string type

Samples:
stringOrValue('${2+3}') -> 5
stringOrValue('woof is ${3+5}') would produce 'woof is 8'.

Changes

Create a new function that can evaluate the value expression smartly.

Please review and, if necessary, port the changes.