v2.7.0 - changing new kql/sentinel drivers to be defaults

[ianhelle]

Updated DataEnvironment enum to add IDs for Legacy drivers in query_defns.py Updated driver mapping for new drivers in data/drivers/init.py Updated documentation Removed dependency on kql_driver in test_query_source.py Removed redundant formatters in kql_driver.py (since these were identical to the query_source defaults) Changes to requirements.txt and setup.py:

• added azure-kusto-data and azure-monitor-query to default install (requirements.txt)
• also added azure-kusto-secrets, azure-mgmt-kusto and keyring to defaults (requirements.txt
• azure_query and keyvault extras are now empty
• changed httpx to support broader version range
• removed kqlmagiccustom from requirements.txt