create HYSPEC intensity matrix

[KyleQianliMa]

Short description of the changes:

EWM Story 8621

This PR calculates the powder intensity matrix for HyspecPPT. It considers S2 on either side of the detector and contains init, setter and getter functions for related models.

Long description of the changes:

Check list for the pull request

• I have read the [CONTRIBUTING]
• I have read the [CODE_OF_CONDUCT]
• I have added tests for my changes
• I have updated the documentation accordingly

Check list for the reviewer

• I have read the [CONTRIBUTING]
• I have verified the proposed changes
• best software practices
  • all internal functions have an underbar, as is python standard
  • clearly named variables (better to be verbose in variable names)
  • code comments explaining the intent of code blocks
• All the tests are passing
• The documentation is up to date
• code comments added when explaining intent

Manual test for the reviewer

All tests should pass using pytest

References

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.36%. Comparing base (f7b5f76) to head (6e8f5b3).

Additional details and impacted files

@@            Coverage Diff             @@
##             next      #24      +/-   ##
==========================================
+ Coverage   92.90%   98.36%   +5.45%     
==========================================
  Files          10       10              
  Lines         747      732      -15     
==========================================
+ Hits          694      720      +26     
+ Misses         53       12      -41     

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[AndreiSavici]

Looks reasonable