PEP 814 -- Add frozendict built-in type

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Please consider PEP 814 -- Add frozendict built-in type
https://peps.python.org/pep-0814/

• The PEP has been discussed in threads listed in its Post-History header
• The PEP was announced on Discuss (link in Post-History)
• The PEP includes all relevant Suggested Sections
• The PEP includes endorsements from the projects/groups/people it helps
• The PEP has a CODEOWNERS entry

SIG-specific:

• Typing PEPs: link to the Typing Council's recommendation for the PEP:
• Packaging PEPs: don't file the issue here, ask the delegate (Paul Moore) on Packaging Discourse