Support LRC/VTT file to be imported

Sentry Issue: KM-SERVER-176

Error: GET_KARA_ERROR
  File "/srv/kmserver/kmserver-core/src/services/kara.ts", line 214, in getKara
    throw err instanceof ErrorKM ? err : new ErrorKM('GET_KARA_ERROR');
  File "/srv/kmserver/kmserver-core/src/services/gitlab.ts", line 23, in createInboxIssue
    q: `k:${kid}`
  File "/srv/kmserver/kmserver-core/src/services/karaImport.ts", line 104, in heavyLifting
    issueURL = await createInboxIssue(karaData.data.kid, edit);
  File "/srv/kmserver/kmserver-core/src/services/karaImport.ts", line 152, in createKara
    return await heavyLifting(kara, contact);
  File "/srv/kmserver/kmserver-core/src/controllers/http/karaImport.ts", line 19, in <anonymous>
    res.status(200).json(APIMessage('GENERATED_KARA', url || ''));