Port PyPy's new unicode name db format to optimize binary CPython size

[isidentical]

Feature or enhancement

PyPy has a new algorithm that might help us reduce the unicode name db size of our binaries (which would be helpful on our way forward to better WASM compatibility [through reduced download sizes]). For more details, you can see the new implementation in PyPy side by @cfbolz.

CC: @ambv @cfbolz

We'll probably start with missing tests, and then build out a prototype to see how feasible it is and will share numbers on how much it would help before going forward with the implementation.

Linked PRs

• gh-96954: use a directed acyclic word graph for storing the unicodedata codepoint names #97906
• gh-96954: Use skip_if_missing in test_makeunicodedata #111764
• gh-96954: Fix make regen-unicodedata in out-of-tree builds #112118
• gh-96954: Don't run regen-unicodedata in regen-all #112120