Implement the auth provider for MONGODB-OIDC authentication.

AC:

• Create the auth provider for the mechanism string MONGODB-OIDC
• Write the Authorization Code Flow prose test and the corresponding implementation for callbacks.
• Write the AWS Device Flow prose test and the corresponding implementation using AWS_WEB_IDENTITY_TOKEN_FILE
• Write the Multiple Principals prose test and the corresponding implementation for both callbacks and aws.
• Write the Invalid Callbacks prose test and the corresponding validation checks.
• Write the Cached Credentials prose test and the corresponding caching behaviour.
• Add the ability to provide the initial saslStart command in speculative authentication in the initial handshake.
• Make API public