DRAFT: Attach schema name as tag with index usage metrics

[azhou-datadog]

What does this PR do?

Will send the associated schema name along with index usage metrics

Motivation

This aligns sqlserver's metrics around index usage that postgres provides, which allows us to give a detailed unused index recommendation.

Review checklist (to be filled by reviewers)

• Feature or bugfix MUST have appropriate tests (unit, integration, e2e)
• Add the qa/skip-qa label if the PR doesn't need to be tested during QA.
• If you need to backport this PR to another branch, you can add the backport/<branch-name> label to the PR and it will automatically open a backport PR once this one is merged

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 87.84%. Comparing base (2ea7fe9) to head (fe31766).
Report is 1 commits behind head on master.

Additional details and impacted files

Flag	Coverage Δ
activemq	?
cassandra	?
hive	?
hivemq	?
ignite	?
jboss_wildfly	?
kafka	?
presto	?
solr	?
sqlserver	89.92% <100.00%> (+8.27%)	⬆️

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