Enable MSAL settings to save access token in cache

[JhontSouth]

#minor

Description

This PR adds the necessary MSAL settings to manage the cached access token value and not request a new value on each request.

Specific Changes

• Added SetCacheOptions to the AppTokenCache of the ClientApplication in MsalAppCredentials class.

Testing

The following images show the interaction with the bot and the token values in every message.

[tracyboehrer]

@JhontSouth Appears to be failing in the Connector unit tests.

[tracyboehrer]

@JhontSouth We should check this in Node JS SDK too.

[coveralls]

Pull Request Test Coverage Report for Build 378018

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 45 unchanged lines in 2 files lost coverage.
• Overall coverage decreased (-0.007%) to 78.443%

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Files with Coverage Reduction	New Missed Lines	%
/libraries/AdaptiveExpressions/LRUCache.cs	4	87.18%
/libraries/Microsoft.Bot.Connector/Authentication/MsalAppCredentials.cs	41	13.04%

Totals
Change from base Build 378011:	-0.007%
Covered Lines:	26130
Relevant Lines:	33311

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💛 - Coveralls

[BruceHaley]

✔️ No Binary Compatibility issues for Microsoft.Bot.Connector.dll