Allow globbing in read and file args.

[chr15m]

This patch allows the user to specify multiple matching files during 'read' and 'file' both on the command line and in the config file. This is useful for including multiple files of non-code context shared across multiple projects - for example:

aider --read '/home/USERNAME/.aider-context/*.md'`

Or in the config file:

read: [/home/USERNAME/.aider-context/*.md]

Fixes #3366.

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3 out of 6 committers have signed the CLA.

✅ KennyDizi
✅ chr15m
✅ FelixLisczyk
❌ banjo
❌ paul-gauthier
❌ tylersatre
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[chr15m]

Fixed merge conflicts. @paul-gauthier

[chr15m]

@paul-gauthier I have added more information above explaining why this feature is useful.

[chr15m]

I have merged main into this PR again.