Add xas reader

[lucyhaddad-dls]

Add in the most recent utils for reading nexus, ascii and .dat files.

[codecov]

Codecov Report

❌ Patch coverage is 0% with 943 lines in your changes missing coverage. Please review.
✅ Project coverage is 1.25%. Comparing base (256234a) to head (0d59dff).
⚠️ Report is 5 commits behind head on main.

Files with missing lines	Patch %	Lines
src/xas_toolbox/io/measurement_types.py	0.00%	252 Missing ⚠️
src/xas_toolbox/io/readers/multi_file.py	0.00%	123 Missing ⚠️
src/xas_toolbox/io/filetypes/nexus/nxs_reader.py	0.00%	99 Missing ⚠️
src/xas_toolbox/io/filetypes/xdi.py	0.00%	87 Missing ⚠️
src/xas_toolbox/io/xas_measurement.py	0.00%	66 Missing ⚠️
src/xas_toolbox/io/filetypes/nexus/b18.py	0.00%	62 Missing ⚠️
src/xas_toolbox/io/filetypes/nexus/i20_1.py	0.00%	50 Missing ⚠️
src/xas_toolbox/io/filetypes/ascii.py	0.00%	49 Missing ⚠️
src/xas_toolbox/utils/scan_data.py	0.00%	35 Missing ⚠️
src/xas_toolbox/io/readers/single_file.py	0.00%	32 Missing ⚠️
... and 8 more

Additional details and impacted files

@@             Coverage Diff             @@
##              main      #4       +/-   ##
===========================================
- Coverage   100.00%   1.25%   -98.75%     
===========================================
  Files            2      20       +18     
  Lines           12     955      +943     
===========================================
  Hits            12      12               
- Misses           0     943      +943     

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