Add support to suggest metrics names

Proposal

Have a method that returns the name suggestion corresponding to the implementation and key path

• For non database metrics - build a suggested name
• For database metrics will return a general placeholder

Resources:

Existing naming suggestion implementation could be used.

• https://gitlab.com/gitlab-org/gitlab/-/tree/master/lib/gitlab/usage/metrics/names_suggestions
• https://docs.gitlab.com/ee/development/usage_ping/metrics_dictionary.html#metric-name