[PECOBLR-587] Azure Service Principal Credential Provider

[jprakash-db]

Description

This pull request introduces support for Azure Service Principal M2M (SP) authentication to the PySQL Connector

Key Changes

• AzureServicePrincipalCredentialProvider, this is the provider that will deal with getting the creds using the azure credentials
• ClientCredentialsTokenSource, is responsible for managing the token lifecycle for the flow where credentials are obtained using the grant_type: client_credentials
• Introduced a common HTTP client called DatabricksHttpClient that can be used to unify the Http logic across the connector, to ensure standard client level behaviour

New dependencies

• Introduced library PyJWT which is required for handling JWT parsing functionalities

Tests

Expanded unit tests to cover:

• AzureServicePrincipalCredentialProvider.
• ClientCredentialsTokenSource

Manual Testing

• Tested the Azure M2M SP flow by creating a SP using Azure Entra ID and then mapping it to a workspace SP. Further queries were made to the workspace using the Azure Entra ID credentials to test it on Databricks Workspace

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[vikrantpuppala]

minor comment, otherwise lgtm

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