Instrument() does not take dictionaries as input for the glitches keyword

Current behaviour:

Instrument(...,glitches=...,....) accepts only a string (interpreted as a filename) or None as input:

 if isinstance(glitches, str):
  ...    
 elif glitches is None:
  ...
 else:
    raise ValueError(f"invalid value '{glitches}' for glitches")

Expected behaviour:

Accept also:

• a pre-read HDF file: <HDF5 file "..." (mode r)>
• pre-filled dictionary with keys as in lisaglitch.INJECTION_POINTS and
  • either values of length len(physics_t)
  • or a callable which can be called at all points of physics_t

added feature label