allow host address input in MS Graph configuration

[delliott90]

Adds custom host input support for connecting to Microsoft Graph API. This is to allow for cases where a different host address is required for US Government agencies. https://learn.microsoft.com/en-us/answers/questions/434905/microsoft-graph-api-for-azure-us-government-plan

[codecov]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Files	Coverage Δ
...ules/azure_sentinel/stix_transmission/connector.py	71.07% <100.00%> (-0.24%)	⬇️
...les/azure_sentinel/stix_transmission/api_client.py	22.50% <50.00%> (ø)

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