Release Azure.Identity Library Preview 1 for Javascript

[AlexGhiondea]

Goal:

Release the Azure.Identity library
Integrate this library in the other client libraries.

• Finalize Azure.Identity footprint for SDK Preview
• Azure.Core Updates (PR [Identity] Add new @azure/identity library and @azure/core-http abstractions #3449)
  • TokenCredential ABC
  • BearerTokenAuthenticationPolicy
• Azure.Identity
  • Classes (PR [Identity] Add new @azure/identity library and @azure/core-http abstractions #3449, [Identity] Add ManagedIdentityCredential implementation #3686, [Identity] Add ClientCertificateCredential implementation #3790)
    • AzureCredential
    • ClientSecretCredential
    • ClientCertificateCredential
    • ManagedIdentityCredential
    • EnvironmentCredential
    • SystemCredential
    • Undecided: GlobalTokenCache? (not in Preview)
  • Implementations (PR [Identity] Add new @azure/identity library and @azure/core-http abstractions #3449, [Identity] Add ManagedIdentityCredential implementation #3686, [Identity] Add ClientCertificateCredential implementation #3790)
    • EnvironmentCredential
    • ClientSecretCredential
    • ClientCertificateCredential
    • ManagedIdentityCredential
    • SystemCredential
    • Undecided: User Credentials? (not in Preview)
• Integrate @azure/core-http in other SDK libraries so that @azure/identity can be used
  • @azure/event-hubs: [core-amqp] Use @azure/core-http in core-amqp-* to enable @azure/identity use #3830
  • @azure/keyvault-[keys|secrets|certificates]: [KeyVault] Use @azure/core-http in keyvault-* to enable @azure/identity use #3600
  • @azure/storage-[queue|blob|file]: [Storage] Use @azure/core-http in @azure/storage-* libraries to support @azure/identity #3853
• Add all standard sections to README.md ([Identity] Update @azure/identity version, license headers, and… #4048)
• Review metadata in package.json (description, keywords, etc) ([Identity] Update @azure/identity version, license headers, and… #4048)
• Ship @azure/core-http (Release @azure/core-http Library Preview #3497)
• Ship @azure/identity

Post-Preview

• Gap Analysis of MSAL
• Provide Feedback to MSAL Team and schedule updates
• Investigate other authentication schemes we need to support (user auth, auth from shared token cache)

[daviwil]

Created PR Azure/ms-rest-nodeauth#61 to add TokenCredential and BearerTokenAuthenticationPolicy to ms-rest-nodeauth (temporarily until the core Azure.Identity module is created).

[daviwil]

Closing this as Preview1 is shipped!