port: [#4315] Support passing sas token url's for token service (#6449) #4394
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Fixes #4315
Description
This PR introduces support for passing through a token post resource via botbuilder. The token post resource contains a sas url for directly posting a token from a client to the bot framework token service. Botbuilder gets this url from token service and passes it onto the client.
These changes were ported from .NET repository.
Specific Changes
Testing
Added unit tests
Working sample