Use 3rd party for image cache

[taooceros]

Why bother handling the cache ourselves. This pr uses https://github.com/VictoriaMetrics/fastcache for Image Cache. Should resolves #2477

Tested:

• Image Loaded
• Previously loaded image get loaded from cache
• Eviction happened when too much cache (but the code indicate that it will work)

[VictoriousRaptor]

Sorry don't have much time recently. One problem I've found in the current cache mechanic is that images with the same hash can have multiple instances in memory. Please check if this PR can help if possible.

[taooceros]

I don't think that's will be fixed but I think same hash is handled in ImageLoader rather than ImageCache?

[github-actions]

@check-spelling-bot Report

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Unrecognized words (1)

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To accept these unrecognized words as correct, you could run the following commands

... in a clone of the git@github.com:Flow-Launcher/Flow.Launcher.git repository
on the new-image-cache branch (ℹ️ how do I use this?):

curl -s -S -L 'https://raw.githubusercontent.com/check-spelling/check-spelling/prerelease/apply.pl' |
perl - 'https://github.com/Flow-Launcher/Flow.Launcher/actions/runs/8391584445/attempts/1'

OR

To have the bot accept them for you, comment in the PR quoting the following line:
@check-spelling-bot apply updates.

Warnings (1)

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ℹ️ Warnings	Count
ℹ️ non-alpha-in-dictionary	10

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