Add option to override group in create_attribute

[LuisFSegalla]

Add option to select custom group for attribute to be created under.

Based on this issue.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.83%. Comparing base (dee5e4d) to head (9acbfd4).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #97   +/-   ##
=======================================
  Coverage   92.83%   92.83%           
=======================================
  Files          16       16           
  Lines         614      614           
=======================================
  Hits          570      570           
  Misses         44       44           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.

[GDYendell]

Could you add a test for create_attribute in test_util? I think it can be a parameterized test like this.

It should pass different arguments and check the type / fields on the returned attribute.

I am imagining these are the parameterizations (?):

• OdinParameterMetadata(value=0, type="int", writeable=False) -> AttrR
• OdinParameterMetadata(value=0, type="int", writeable=True) -> AttrRW
• OdinParameterMetadata(value=0, type="int", writeable=False) and path=["name"] -> AttrRW(group=None)
• OdinParameterMetadata(value=0, type="int", writeable=False) and path=["my_group", "name"] -> AttrRW(group="MyGroup")
• OdinParameterMetadata(value=0, type="int", writeable=False) and group="MyOtherGroup" -> AttrRW(group="MyGroupOther")