AuthTypeChange: Adds new API to update the AuthType dynamically

[kirankumarkolli]

Pull Request Template

Description

Scenario: Change authentication type between keybased to MSI dynamically with-out re-creating client

Below is a sample mock-up

            LocalEmulatorTokenCredential miTokenCredential = new LocalEmulatorTokenCredential(authKey);
            CosmosAuthorizationTokenProvider authorizationTokenProvider = CosmosAuthorizationTokenProvider.FromTokenCredential(endpoint, miTokenCredential);

            using (CosmosClient client = new CosmosClient(
                    endpoint,
                    miTokenCredential))
            {
                // do some work 

                // Change authentication type to key-based creds
                AzureKeyCredential masterKeyCredential = new AzureKeyCredential(authKey);
                authorizationTokenProvider.Update(CosmosAuthorizationTokenProvider.FromAzureKeyCredential(masterKeyCredential));

                // do some work 
            }

Option 2: de-couple the ProviderFactory and Provider adds one more Type, CosmosClient didn't follow this pattern)

Type of change

Please delete options that are not relevant.

• New feature (non-breaking change which adds functionality)

Closing issues

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