Added slice argument for load_hdf5

[JuanPedroGHM]

Some users have expressed interest in only loading partial slices from an HDF5 dataset. This PR adds the slices argument to load_hdf5, to allow dataset slicing like in the with the h5py API. Removes load_fraction argument to avoid redundancies.

Due Diligence

• General:
  • title of the PR is suitable to appear in the Release Notes
• Implementation:
  • unit tests: all split configurations tested
  • unit tests: multiple dtypes tested
  • benchmarks: created for new functionality
  • benchmarks: performance improved or maintained
  • documentation updated where needed

Description

Issue/s resolved: #

Changes proposed:

• Slice argument for load_hdf5
• Auxiliary function to calculate the new size and offset of a sliced axis

Type of change

Memory requirements

Performance

Does this change modify the behaviour of other functions? If so, which?

yes / no

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[codecov]

Codecov Report

Attention: Patch coverage is 82.60870% with 4 lines in your changes missing coverage. Please review.

Project coverage is 92.24%. Comparing base (87f2812) to head (2b1e647).

Files with missing lines	Patch %	Lines
heat/core/io.py	82.60%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1753      +/-   ##
==========================================
- Coverage   92.26%   92.24%   -0.02%     
==========================================
  Files          84       84              
  Lines       12445    12460      +15     
==========================================
+ Hits        11482    11494      +12     
- Misses        963      966       +3     

Flag	Coverage Δ
unit	92.24% <82.60%> (-0.02%)	⬇️

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