Change IQmod to dataclass

[backmari]

Description of work:

As part of harmonizing the annular binning output, we want to create a base class for 1D intensity profiles, from which IQmod and the new class I1Dannular will inherit. This is a draft PR to explore changing IQmod from namedtuple to dataclass, since inheriting from a namedtuple does not easily allow adding additional attributes. By using dataclass with the frozen flag, we can emulate immutability like for namedtuple.

Check all that apply:

• added release notes (if not, provide an explanation in the work description)
• updated documentation
• Source added/refactored
• Added unit tests
• Added integration tests
• Verified that tests requiring the /SNS and /HFIR filesystems pass without fail

References:

• Links to IBM EWM items: Story 364: [DRTSANS] Harmonizing the output style and content of 1D intensity profile obtained from annular binning
• Links to related issues or pull requests:

Manual test for the reviewer

Check list for the reviewer

• release notes updated, or an explanation is provided as to why release notes are unnecessary
• best software practices
  • 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

Execution of tests requiring the /SNS and /HFIR filesystems

It is strongly encouraged that the reviewer runs the following tests in their local machine
because these tests are not run by the GitLab CI. It is assumed that the reviewer has the /SNS and /HFIR filesystems
remotely mounted in their machine.

cd /path/to/my/local/drtsans/repo/
git fetch origin merge-requests/<MERGE_REQUEST_NUMBER>/head:mr<MERGE_REQUEST_NUMBER>
git switch mr<MERGE_REQUEST_NUMBER>
conda activate <my_drtsans_dev_environment>
pytest -m mount_eqsans ./tests/unit/ ./tests/integration/

In the above code snippet, substitute <MERGE_REQUEST_NUMBER> for the actual merge request number. Also substitute
<my_drtsans_dev_environment> with the name of the conda environment you use for development. It is critical that
you have installed the repo in this conda environment in editable mode with pip install -e . or conda develop .

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 94.82759% with 6 lines in your changes missing coverage. Please review.

Project coverage is 86.13%. Comparing base (df03fa4) to head (d5b9ad4).

Files with missing lines	Patch %	Lines
src/drtsans/dataobjects.py	94.44%	6 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             next    #1001      +/-   ##
==========================================
+ Coverage   86.10%   86.13%   +0.03%     
==========================================
  Files          97       97              
  Lines       10757    10802      +45     
==========================================
+ Hits         9262     9304      +42     
- Misses       1495     1498       +3     

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