What to do about mz_start and mz_end from OpenMS "Features"

[jpfeuffer]

Currently this cannot be stored in qpx feature parquet.

In OpenMS DDA LFQ this is used to store the extension of an MS1 precursor along its isotope traces. Alternatively we could list the number of isotopes that were found or something.

[jpfeuffer]

@timosachsenberg @ypriverol

[timosachsenberg]

in the OpenMS feature parquet we have something like this: https://github.com/OpenMS/OpenMS/blob/ddd482d9852e046208e2b24fc868ac62676ffbef/src/openms/source/FORMAT/ArrowSchemaRegistry.cpp#L287-L290