Cache stat of addon assets

[bdraco]

Proposed change

Since we poll the addons quite a bit we did a lot of stat()s in the event loop

I wasn't 100% sure if the cache of these ever needed to be cleared though.

Type of change

• Dependency upgrade
• Bugfix (non-breaking change which fixes an issue)
• New feature (which adds functionality to the supervisor)
• Breaking change (fix/feature causing existing functionality to break)
• Code quality improvements to existing code or addition of tests

Additional information

• This PR fixes or closes issue: fixes #
• This PR is related to issue:
• Link to documentation pull request:
• Link to cli pull request:

Checklist

• The code change is tested and works locally.
• Local tests pass. Your PR cannot be merged unless tests pass
• There is no commented out code in this PR.
• I have followed the development checklist
• The code has been formatted using Black (black --fast supervisor tests)
• Tests have been added to verify that the new code works.

If API endpoints of add-on configuration are added/changed:

• Documentation added/updated for developers.home-assistant.io

[mdegat01]

The cache would have to be cleared on update of the addon data. An update could change one of those values from false to true or vice versa.

[bdraco]

The cache would have to be cleared on update of the addon data. An update could change one of those values from false to true or vice versa.

271428e

I did it for rebuilds too just to be safe and married it to self.sys_addons.data.update

[bdraco]

The current design doesn't know when the data changes so we don't have a good way to expire the cache.

Sadly stat()s are blocking I/O in the event loop but we can't get rid of them right now