fix: [#2782] Migrate to MSAL from adal-node - Add MSAL support

[ceciliaavila]

#minor
Addresses #2782

Description

This PR adds support for MSAL as the first step to remove ADAL dependency from the repository.
As MSAL supports a limited number of TS versions, we removed support for versions 3.5, 3.6, and 3.7.

Specific Changes

• Added new class MsalAppCredentials.
• Added new class MsalServiceClientCredentialsFactory.
• Updated consumer-test/run.ts to remove old TS versions from the testing matrix.
• Added TS version >= 3.8 as a pre-requisite in the README file

Testing

These images show a bot working with MSAL using credentials and certificates to authenticate.

[coveralls]

Pull Request Test Coverage Report for Build 6469114986

• 15 of 46 (32.61%) changed or added relevant lines in 4 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-0.1%) to 84.766%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
libraries/botbuilder-dialogs-adaptive-runtime-core/src/serviceCollection.ts	1	2	50.0%
libraries/botframework-connector/src/auth/msalServiceClientCredentialsFactory.ts	4	18	22.22%
libraries/botframework-connector/src/auth/msalAppCredentials.ts	8	24	33.33%

Totals
Change from base Build 6406526914:	-0.1%
Covered Lines:	20271
Relevant Lines:	22657

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💛 - Coveralls