feat: implemented biometrics authentication for SecureCredentialsManager using androidx.biometrics package

[desusai7]

Migrated to use BioMetricManager for performing Authentication before accessing credentials via SecureCredentialsManager

Breaking Changes:

• Removed the requireAuthentication API which used to be a pre-requisite previously for performing authentication while retrieving Credentials as it is no longer needed.

New API:

• Added a new API getCredentialsWithAuthentication in SecureCredentialsManager which is responsible for performing authentication before retrieving credentials. It's no longer needed to call requireAuthentication before retrieving credentials.

Other changes:

• We've added a optional dependency on androidx.biometrics package to use the BiometricsManager for authentication purposes and this dependency needs to be added only by the users who are using SecureCredentialsManager
• Added class LocalAuthenticationManager which consolidates all the logic for interacting with the BiometricsManager
• Added class LocalAuthenticationOptions which helps to configure the behaviour of the BiometricsManager like title, description displayed within in the biometric prompt and the level of authentication required.
• Updated CredentialsManagerException to contain enum Code describing the reason for exception and allowing users to check all the cases of CredentialsManagerException and handle accordingly

Testing

Please describe how this can be tested by reviewers. Be specific about anything not tested and reasons why. Since this library has unit testing, tests should be added for new functionality and existing tests should complete without errors.

• This change adds unit test coverage
• This change adds integration test coverage
• This change has been tested on the latest version of the platform/language or why not

Checklist

• I have read the Auth0 general contribution guidelines
• I have read the Auth0 Code of Conduct
• All existing and new tests complete without errors