Add support for target_info metric w/ shared label cache (#19397)

* Collect target info metric

* Corrected cache error

* Log cleanup

* Debug log cleanup

* Add tests to test cache w/ target_info

* Add test for unordered target info with cache shared labels

* Add transformer for info metric type

* Cleaned but not working first iteration

* Refactor tag caching logic

* Validate type for config options

* Added changelog entry

* Fix validate shared labels failing test

* Fix whitespace causing lint failure

* Fix target info with cache, add tests

* Linting

* Cleanup debug log

* Comment cleanup

* Refactor label population

* Reformat imports

* Reorder target_info_labels definition

* Add consume w/ target info method

* Add comments

* Update datadog_checks_base/tests/base/checks/openmetrics/test_v2/test_options.py

Co-authored-by: Steven Yuen <steven.yuen@datadoghq.com>

* lint test

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Co-authored-by: Steven Yuen <steven.yuen@datadoghq.com> d802c07