[#6590] Error while saving bot state to azure blob storage

[sw-joelmut]

Fixes #6590

Description

This PR refactors the use of AllowedTypesSerializationBinder to be optionally provided through a JsonSerializer configuration across Blobs and CosmosDB storage constructors.

Behavior of AllowedTypesSerializationBinder:

• It will only be used in the Blobs and CosmosDB storage when provided through the JsonSerializer.SerializationBinder, otherwise it will not execute any related code to the class.
• When provided, it will evaluate which types need to be allowed and fail with a message to do so.
• When provided with all the types to allow, it will behave as normal, but with an extra layer of security to allow only desired types in the application.

Specific Changes

• Removed all code that was making Blobs, AzureBlobs (removed altogether, since it's deprecated) and CosmosDB storage dependent of the AllowedTypesSerializationBinder class, leaving only the verification process when the class is provided.
• Updated the AllowedTypesSerializationBinder internal class behavior, removing the process that loads the types dynamically to use only the ones provided by the user, and added a step to recognize types that are represented as a generic type (e.g. List).
• Updated the tests related to this process by removing the ones that weren't necessary anymore, and adding new ones to test when the AllowedTypesSerializationBinder is provided through the JsonSerializer instance.

Testing

The following images show the unit tests passing successfully and how the new binder implementation works.

[coveralls]

Pull Request Test Coverage Report for Build 342214

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 5 unchanged lines in 3 files lost coverage.
• Overall coverage decreased (-0.01%) to 79.098%

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Files with Coverage Reduction	New Missed Lines	%
/libraries/AdaptiveExpressions/BuiltinFunctions/GetNextViableTime.cs	1	90.91%
/libraries/AdaptiveExpressions/BuiltinFunctions/GetPreviousViableTime.cs	1	90.91%
/libraries/Microsoft.Bot.Builder/AllowedTypesSerializationBinder.cs	3	95.65%

Totals
Change from base Build 341699:	-0.01%
Covered Lines:	25813
Relevant Lines:	32634

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💛 - Coveralls

[BruceHaley]

✔️ No Binary Compatibility issues for Microsoft.Bot.Builder.dll
✔️ No Binary Compatibility issues for Microsoft.Bot.Builder.Azure.dll