Additional methods for FormatISISSXD to extract data more efficiently.

[toastisme]

This adds methods to FormatISISSXD for extracting data at the image and pixel level, where the time-of-flight dimension is flattened. This is required for visualisation purposes, and having methods at the format class level allows for data to be extracted more efficiently. Methods for getting the instrument name and proton charge are also added. The latter is required for scaling.

[codecov]

Codecov Report

Attention: Patch coverage is 12.19512% with 36 lines in your changes missing coverage. Please review.

Project coverage is 41.69%. Comparing base (4e46bec) to head (773e4a2).
Report is 1 commits behind head on main.

Additional details and impacted files

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- Coverage   41.75%   41.69%   -0.07%     
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  Files         188      188              
  Lines       16880    16920      +40     
  Branches     3233     3240       +7     
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+ Hits         7049     7054       +5     
- Misses       9181     9216      +35     
  Partials      650      650