Assume the current object as an implicit owner for hierarchies

[nolar]

Assume the currently handled object as the default owner when adopting.

Issue: closes #56

Description

Simplify the usage of hierarchy management functions to make owner optional. If not specified, the currently handler object is assumed to be the owner, or the source of name prefix and namespace.

This is not done for labels, as I am not sure that kopf.label(obj) semantically implies the label transfer from the currently handled object. The labelling remains explicit.

Types of Changes

• New feature (non-breaking change which adds functionality)

Review

List of tasks the reviewer must do to review the PR

• Tests
• Documentation

[zincr]

🤖 zincr found 0 problems , 1 warning

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Large Commits

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This file contains a substantial change, please review to determine if the change comes from an external source and if there are any copyright or licensing issues to be aware of

• ℹ️ tests/hierarchies/test_contextual_owner.py had +100 lines of code changed in a single commit
  Please review this file to determine the source of this change
   

[zincr]

🤖 zincr found 1 problem , 1 warning

❌ Approvals
ℹ️ Large Commits
✅ Specification
✅ Dependency Licensing

Details on how to resolve are provided below

---

Approvals

All proposed changes must be reviewed by project maintainers before they can be merged

Not enough people have approved this pull request - please ensure that 1 additional user, who have not contributed to this pull request approve the changes.

• ✅ Approved by PR author @nolar
• ❌ 1 additional approval needed
   

Large Commits

Checks all commits for large additions to a single file. Large commits should be reviewed more carefully for potential copyright and licensing issues

This file contains a substantial change, please review to determine if the change comes from an external source and if there are any copyright or licensing issues to be aware of

• ℹ️ tests/hierarchies/test_contextual_owner.py had +100 lines of code changed in a single commit
  Please review this file to determine the source of this change