Add support for target_info metric w/ shared label cache

[UTXOnly]

What does this PR do?

• Add support for openmetrics target_info type
  • https://github.com/prometheus/OpenMetrics/blob/main/specification/OpenMetrics.md#supporting-target-metadata-in-both-push-based-and-pull-based-systems

Motivation

• AI-2874

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 84.42%. Comparing base (bd8de59) to head (97d9433).
Report is 125 commits behind head on master.

❗ There is a different number of reports uploaded between BASE (bd8de59) and HEAD (97d9433). Click for more details.

HEAD has 4 uploads less than BASE

Flag	BASE (bd8de59)	HEAD (97d9433)
weblogic	1	0
datadog_checks_dev	2	1
datadog_checks_downloader	2	1
ibm_mq	2	1

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[steveny91]

@UTXOnly

is it possible to have more than 1 target_info entry? Or would there always be 1 only per payload?

Review from steveny91 is dismissed.
Related teams and files:

• agent-integrations
  • datadog_checks_base/tests/base/checks/openmetrics/test_v2/test_options.py