Database only collection list

[camdencheek]

Description of the changes

A highly requested feature is for users to be able to collect everything in a database without the strange nested syntax required before. This allows collection_list to be specified as a JSON array of database names. The integration will auto-discover all the schemas, tables, and indexes in that database and collect metrics for all of them. This may lead to larger collection sizes.

PR Review Checklist

Author

• add a risk label after carefully considering the "blast radius" of your changes
• describe the intent of your changes in the description. don't just rewrite your code in prose
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Reviewer

• review code for readability
• verify that high risk behavior changes are well tested
• check license for any new external dependency
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• approve the PR when you consider it's good to merge