✨ Recursively query parents and children

[Koncopd]

This PR adds query_parents and query_children methods to the HasParents class. This allows to query all parents and parents of parents etc. recursively for a record.

Example:

import lamindb as ln

label1 = ln.ULabel(name="label1").save()
label2 = ln.ULabel(name="label2").save()
label3 = ln.ULabel(name="label3").save()
label1.children.add(label2)
label2.children.add(label3)
label3.query_parents() # returns a QuerySet with label1 and label2
label1.query_children() # returns a QuerySet with label2 and label3

Docs:

• https://github.com/laminlabs/lamindb/pull/2126

Resolves:

• https://github.com/laminlabs/lamindb/issues/2060

Needs:

• https://github.com/laminlabs/lnschema-core/pull/444

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 92.53%. Comparing base (c41fc2c) to head (1ab7f1a). Report is 7 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #2106 +/- ## ======================================= Coverage 92.52% 92.53% ======================================= Files 54 54 Lines 6435 6442 +7 ======================================= + Hits 5954 5961 +7 Misses 481 481 ```

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[github-actions[bot]]

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[falexwolf]

This looks very elegant both in terms of the actual implementation and the user-facing API design. Kudos!

The only thing that's missing: a nice user-facing description of this PR.

[Koncopd]

Ok, adding and merging then.