Add BlockNectarCAMEventSource class

[vmarandon]

Will read the data per block instead of all the files together. This remove the limitation of long acquisition that consume too much memory and reach quickly the limit of opened file.

The grouping of the blocks is 4 by default and correspond to the number of data stream of the acquisition.

There is also option to only read a certain set of blocks

[codecov]

Codecov Report

Attention: Patch coverage is 13.82114% with 106 lines in your changes missing coverage. Please review.

Project coverage is 78.46%. Comparing base (60533fe) to head (85a98a5).
Report is 40 commits behind head on main.

Files with missing lines	Patch %	Lines
src/ctapipe_io_nectarcam/__init__.py	13.82%	106 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##             main      #60       +/-   ##
===========================================
- Coverage   88.75%   78.46%   -10.29%     
===========================================
  Files           7        7               
  Lines         685      915      +230     
===========================================
+ Hits          608      718      +110     
- Misses         77      197      +120     

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[jlenain]

Hi @vmarandon !

Thanks a lot for that!

It would be good indeed if the new class BlockNectarCAMEventSource could inherit from NectarCAMEventSource.