Return a 70 error code if the id's in subsonic scrobble are invalid

[cquike]

This PR tries to implement the behaviour described in the OpenSubsonic discussion opensubsonic/open-subsonic-api#201

Maybe it is implemented in a bit of a naive way, specially creating the tack objects might not be necessary to check whether the track id is correct or not.

If any of the id's is invalid, the answer now contains the error 70:

$ curl "https://example.org/rest/scrobble.view?id=tr-999999&id=tr-20000&time=1688760805000&time=1688760805000&submission=True&c=curl&v=1.16.0&f=json&u=user&p=enc:9999999999999999999999999999999999999999999999999999999999999"
{"subsonic-response":{"openSubsonic":true,"serverVersion":"v3.74.0","status":"failed","type":"lms","version":"1.16.1","error":{"code":70,"message":"The requested data was not found."}}}%

[epoupon]

Hello! Thanks for the PR 👍
I will fix some issues (like fix build, and more efficient way to check) before submitting