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Description

Adding support for ExternalAppAuthenticationForCEA. This is a new capability available only for MChat to call in cases the thrid party app is backed with Custom Engine Agent.
The ExternalAppAuthenticationForCEA APIs work similar to ME APIs AuthenticateAndResendRequest and AuthenticateWIthSSOAndResendRequest that exist in ExternalAppAuthentication capability. The few differences are

1. There are two more APIs, AuthenticateWithSSO and AuthenticateWithOauth. The purpose of each API can be read in externalAppAuthenticationForCEA.ts file.
2. CEA APIs take coversationId along with other parameters
3. CEA takes AppId object instead of string type

If this Pull Request should close/resolve any issues when merged, use the special syntax for that here.

Main changes in the PR:

1. Added ExternalAppAuthenticationForCEA capability to teamsjs
2. Added corresponding test app changes
3. Added e2e test file

Validation

Validation performed:

1. <Step 1>
2. <Step 2>

Unit Tests added:

Unit tests are required for all changes. If no unit tests were added as part of this change, please explain why they aren't necessary.

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End-to-end tests added:

<Yes/No>

Additional Requirements

Change file added:

Ensure the change file meets the formatting requirements.

<Yes/No>

Related PRs:

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Next/remaining steps:

List the next or remaining steps in implementing the overall feature in subsequent PRs (or is the feature 100% complete after this?).

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• Item 1
• Item 2

Screenshots:

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