Support array_of_encoded_equalsized_arrays

[oschulz]

This works now:

using LegendDataTypes, LegendHDF5IO, HDF5
using LegendDataTypes: readdata, writedata

f = lh5open("l200-pxx-rxxx-cal-xxxxxxxxTxxxxxxZ-tier_raw.lh5")

ch = "chxxxxxxx"
chds = f.data_store[ch]

data = readdata(chds, "raw")

pwfs = data.waveform_presummed
wwfs = data.waveform_windowed

data_dec = decode_data(data)

CC @theHenks

CC @apmypb - now we need this to work using LHDataStore as well.

[oschulz]

CC @dcschaper - have a play if you like.

[codecov]

Codecov Report

Attention: Patch coverage is 8.10811% with 34 lines in your changes are missing coverage. Please review.

Project coverage is 50.00%. Comparing base (bc485fa) to head (559a601).

Files	Patch %	Lines
src/generic_io.jl	2.94%	33 Missing ⚠️
src/radsig_io.jl	66.66%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #38      +/-   ##
==========================================
- Coverage   51.85%   50.00%   -1.86%     
==========================================
  Files           6        6              
  Lines         648      676      +28     
==========================================
+ Hits          336      338       +2     
- Misses        312      338      +26     

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