devel/py-azure-mgmt-eventhub: Update to 12.0.0b1

• Update COMMENT
• Update WWW
• Add LICENSE_FILE
• Sort RUN_DEPENDS
• Convert to USE_PYTHON=pep517
• Update pkg-descr

Changes: https://github.com/Azure/azure-sdk-for-python/releases

		https://github.com/Azure/azure-sdk-for-python/blob/main/sdk/eventhub/azure-mgmt-eventhub/CHANGELOG.md