Check and fix backends for the new Spectra version

[jorainer]

If needed, add extractByIndex() for MsBackend implementations in external packages. These packages would then need to depend on Spectra version 1.15.10. This is only required if the backend extends MsBackendCached. Packages are:

• [x] MsBackendSql
• [x] CompoundDb
• [x] MsBackendMgf
• [x] MsBackendMsp
• [x] MsBackendMassbank
• [x] MsbackendMetaboLights
• [x] MsBackendRawFileReader: https://github.com/fgcz/MsBackendRawFileReader/pull/23
• [ ] MsBackendWeizMass
• [ ] MsBackendMS
• [ ] MsBackendSirius
• [ ] MsBackendMzVault: https://github.com/meowcat/MsBackendMzVault/pull/4
• [ ] MsBackendImzML
• [ ] MsBackendAgilentCef