[receiver/sqlserver] Add lock wait count metric

[crobert-1]

Component(s)

receiver/sqlserver

Describe the issue you're reporting

This is a request to add a new metric for the total number of lock waits. This would use the value from the total_lock_wait_count perf counter, and we'd get the metric from a direct connection to the DB, querying the table.

My initial metric name suggestion is sqlserver.lock.wait.count, to make it similar to the existing rate metric.

We'll have to modify the existing perf counter query as it's not scraping this perf counter. We can reference the telegraf query for implementation.

[github-actions]

Pinging code owners:

• receiver/sqlserver: @StefanKurek @sincejune @crobert-1

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[bacherfl]

(Triage) removing needs-triage, as the issue has been proposed by a code owner, and there is a PR already