extract email from id_token for azure provider (#914)

* extract email from id_token for azure provider

this change fixes a bug when --resource is specified with non-Graph
api and the access token destined to --resource is used to call Graph
api

* fixed typo

* refactor GetEmailAddress to EnrichSessionState

* make getting email from idtoken best effort and fall back to previous behavior when it's absent

* refactor to use jwt package to extract claims

* fix lint

* refactor unit tests to use test table
refactor the get email logic from profile api

* addressing feedback

* added oidc verifier to azure provider and extract email from id_token if present

* fix lint and codeclimate

* refactor to use oidc verifier to verify id_token if oidc is configured

* fixed UT

* addressed comments

* minor refactor

* addressed feedback

* extract email from id_token first and fallback to access token

* fallback to access token as well when id_token doesn't have email claim

* address feedbacks

* updated change log!