Make custom annotation generation deterministic

[vidit2606]

Changing code which generates python datatypes for stone. This would make custom_annotation related generated code to be deterministic in nature (alphabetic order)

Checklist

General Contributing

• Have you read the Code of Conduct and signed the CLA?

Is This a Code Change?

• Non-code related change (markdown/git settings etc)
• [ X] Code Change
• Example/Test Code Change

Validation

• Have you ran tox?
• Do the tests pass?

[codecov]

Codecov Report

Attention: Patch coverage is 50.00000% with 3 lines in your changes are missing coverage. Please review.

Project coverage is 51.93%. Comparing base (e242f7f) to head (a4dff04).

Files	Patch %	Lines
stone/cli.py	0.00%	2 Missing ⚠️
stone/backends/python_types.py	75.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #326      +/-   ##
==========================================
- Coverage   51.93%   51.93%   -0.01%     
==========================================
  Files          37       37              
  Lines        8415     8419       +4     
  Branches     1807     1809       +2     
==========================================
+ Hits         4370     4372       +2     
- Misses       3729     3731       +2     
  Partials      316      316              

Flag	Coverage Δ
unit	51.93% <50.00%> (-0.01%)	⬇️

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[julianlocke]

The added untested lines are just imports, so I'm not worries about the code cove warnings.