Add `abc templates cleanup-temp-dirs`
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enhancement
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Description
### TL;DR
In some places we leave temp directories on the filesystem after exit (e.g. with `--keep-temp-dirs`). It would be cool if these directories were in a well-known location, then we could have a single command like `abc templates cleanup-temp-dirs` to remove them all.
Credit to @sqin2019 for the idea.
### Detailed design
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### Alternatives considered
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### Additional information
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