Support new Azure audit logs and signin logs

[kaiyan-sheng]

What does this PR do?

This PR is to add support for the new Azure audit logs and signin logs. Sample logs are provided by the Azure team and added into /_dev/test/pipeline for both auditlogs data stream and signinlogs data stream in Azure package.

This PR added two fields for audit logs and 4 fields for signin logs:

• azure.auditlogs.level
• azure.auditlogs.properties.authentication_protocol
• azure.signinlogs.properties.authentication_protocol
• azure.signinlogs.properties.incoming_token_type
• azure.signinlogs.properties.service_principal_credential_key_id
• azure.signinlogs.properties.unique_token_identifier

Checklist

• I have reviewed tips for building integrations and this pull request is aligned with them.
• I have verified that all data streams collect metrics or logs.
• I have added an entry to my package's changelog.yml file.
• I have verified that Kibana version constraints are current according to guidelines.

[elasticmachine]

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Build stats

• Start Time: 2022-02-15T19:21:29.873+0000

• Duration: 19 min 3 sec

Test stats 🧪

Test	Results
Failed	0
Passed	84
Skipped	0
Total	84

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