Linter to warn if the summary field is over 78 characters
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Current evaluation
No evaluation has been recorded for this issue yet.
Issue body
### What needs to get done
If the summary field is more than 78 characters long, warn the user during the linting process.
### Why it needs to get done
Charmcraft 3.0 introduces a summary length limit, but 78 broke too many charms. At a future point, we can revisit this limit and reduce it.
Evaluation history
No evaluation history available.