fix: typo in Container method name: type_of_conatiner --> type_of_container

[edmondchuc]

Summary of changes

Fixes #2689.

• Add new method rdflib.container.Container.type_of_container
• Add deprecation warning to rdflib.container.Container.type_of_conatiner

Checklist

• Checked that there aren't other open pull requests for
  the same change.
• Checked that all tests and type checking passes.
• If the change adds new features or changes the RDFLib public API:
  • Created an issue to discuss the change and get in-principle agreement.
  • Considered adding an example in ./examples.
• If the change has a potential impact on users of this project:
  • Added or updated tests that fail without the change.
  • Updated relevant documentation to avoid inaccuracies.
  • Considered adding additional documentation.
• Considered granting push permissions to the PR branch,
  so maintainers can fix minor issues and keep your PR up to date.

[coveralls]

coverage: 90.975% (+0.02%) from 90.959%
when pulling 9c9faa0 on fix/issue-2689
into 9834665 on main.