[Feature Request] Add ROPC support for CCA

[neha-bhargava]

Is your feature request related to a problem? Please describe.
Add ROPC flow to Id web for CCA and potentially extend it to use user fic in MISE

Describe the solution you'd like

ClaimsPrincipal user= ClaimsPrincipalFactory.FromUsernamePassword("user@domain.com", "pwd");
downstreamApi.CallApiForUser("api", user: user);

Possible design

• In ClaimsPrincipalFactory add a method to return a ClaimsPrincipal with 2 claims (xms-username and xms-password) based on the values provided.

• In TokenAcquisition.GetAuthenticationResultForUserAsync, if the user parameter is not null, and has the 2 claims xms-username and xms-password claims, then perform ROPC for CCA as a first step (in the try to still benefit from the client credentials rotation)

Describe alternatives you've considered

Additional context