[Feature] Include CORS policy for remote API to allow cross-site request about kenku-fm

[MartinRied]

For reference, see the commit in my fork here:
main...MartinRied:kenku-fm:feature/allow-cors

[Heonozis]

bump

[Heonozis]

Describe the bug
I'm working on Owlbear Rodeo addon for Kenku FM control and can not achieve desirable result without having to do a custom build of Kenku.

I'm facing this bug:
When connecting to my Kenku FM instance from the browser it gives CORS error because there is no cross origin allowed.

To Reproduce
Steps to reproduce the behavior:

Open Kenku FM
Enable Remote control with default settings (127.0.0.1:3333)
Go to https://google.com/
Open developer console
run fetch('http://127.0.0.1:3333/v1/playlist')
Error: Access to fetch at 'http://127.0.0.1:3333/v1/playlist' from origin 'https://www.google.com' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource. If an opaque response serves your needs, set the request's mode to 'no-cors' to fetch the resource with CORS disabled.
Expected behavior
Returned list of playlists as specified in documentation

Screenshots
None

Desktop (please complete the following information):

OS: MacOS
Version: Monterey (M1)
Additional context
After I made an adjustment suggested in #62 issue it worked.

Please consider adding flag in setting to allow CORS for integrations.