[issue38043] small cleanups in Unicode normalization code

[Greg Price]

New submission from Greg Price <gnprice at gmail.com>:

Benjamin noticed in reviewing GH-15558 (for #37966) several points where the existing code around Unicode normalization can be improved:

* on the `QuickcheckResult` enum:
  > Maybe `makeunicodedata.py` should output this enum (with better name namespacing)

* > merging `test_normalization` into this file [i.e. `test_unicodedata.py`] for clarity

* > These "boolean int" parameters could be actual `bool`s. [sc. the `nfc` and `k` parameters to `is_normalized_quickcheck`]

None of these are super hard, so good to knock them out while we're thinking of them.

----------
components: Unicode
messages: 351229
nosy: Greg Price, benjamin.peterson, ezio.melotti, vstinner
priority: normal
severity: normal
status: open
title: small cleanups in Unicode normalization code
versions: Python 3.9

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue38043>
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