Expose more configurations like allowing a way to disable certain collectors

[nishant-dash]

Going off of #182 it is useful to allow disabling collectors from the charm or setting log level to debug

I had to run

snap set charmed-openstack-exporter disable-service.gnocchi=true
snap set charmed-openstack-exporter log.level=debug

[syncronize-issues-to-jira]

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The internal ticket has been created: https://warthogs.atlassian.net/browse/SOLENG-1796.

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