vt: introduce gen_ucs_recompose_table.py to create ucs_recompose_table.h

vt: introduce gen_ucs_recompose_table.py to create ucs_recompose_table.h

The generated table maps base character + combining mark pairs to their
precomposed equivalents using Python's unicodedata module.

The default script behavior is to create a table with most commonly used
Latin, Greek, and Cyrillic recomposition pairs only. It is much smaller
than the table with all possible recomposition pairs (71 entries vs 1000
entries). But if one needs/wants the full table then simply running the
script with the --full argument will generate it.

Signed-off-by: Nicolas Pitre <npitre@baylibre.com>
Reviewed-by: Jiri Slaby <jirislaby@kernel.org>
Link: https://lore.kernel.org/r/20250417184849.475581-8-nico@fluxnic.net
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>