Importers: create reusable database logger

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The Import::Framework::ImportFailure record stores a database record with information for debugging import failures.

• Filtered backtrace information
• Import type, for example github, bitbucket, bitbucket_server
• Related group or project
• The import instance. I'm not sure what noun to use to describe this. Everything that happens related to a single instance of a user triggering an import.
• Something from which we can derive a user friendly error message. We would like to avoid a situation where a user requires expert knowledge to understand what went wrong and what to do next.