[characters] add code for extracting the “classifiers” table

The extraction code itself was taken from luatex-basics-prepare.tex. In
Context, this file generates “luatex-basics-chr.lua” a stripped down
version of char-def.lua. Just as our exisiting mkcharacters script.
Interesting that Hans chose a similar path to what we do ;) The code,
which requires some functionality from char-ini.lua, has thus been added
as a function to the script.

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