Support logger injection

[ciarams87]

As a user of the prometheus exporter as a library
I would like a mechanism to inject a logger
So that I can provide my own logging structure

[brianehlert]

Hey @ciarams87
Not a lot of information here about what this entails.
Are there any impacts on core prometheus exporter users?

[lucacome]

I think this should be possible with the new changes made in #420

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[kate-osborn]

I think this should be possible with the new changes made in #420

@lucacome The logger we use in NGF (logr.Logger) does not implement the log.Logger interface so this is still an issue for us.

[github-actions]

This issue is stale because it has been open 90 days with no activity. Remove stale label or comment or this will be closed in 10 days.

[github-actions]

This issue was closed because it has been stalled for 10 days with no activity.