gh-156667: Add DOM Level 3 names to minidom

[Wanbinyu]

Summary

• add the DOM Level 3 Recommendation names for the affected minidom methods and attributes
• keep the names from the earlier working drafts working as compatibility aliases
• add regression tests for the new names and a Library NEWS entry

getFeature(feature, version) follows the final DOM Level 3 signature, while the existing one-argument getInterface(feature) behavior is preserved. The new attribute names share their values with the existing names.

Closes #156667

Tests

• PCbuild\amd64\python_d.exe -m test -u cpu test_minidom test_pulldom test_xml_dom_minicompat test_xml_dom_xmlbuilder test_xml test_sax
• PCbuild\amd64\python_d.exe Tools\patchcheck\patchcheck.py
• PCbuild\build.bat -p x64 -c Debug (0 warnings, 0 errors)

This contribution was prepared with assistance from OpenAI Codex. I reviewed, adjusted, and tested the resulting changes.

• Issue: xml.dom.minidom uses names from superseded drafts of DOM Level 3 #156667