skeema / skeema / 27662623471

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lexer: fix schema-qualified unquoted table name starting w/ digits

This commit fixes an obscure edge case in Skeema's lexer, which could cause
incorrect object name detection for input like "test2.1table". This should be
lexed as [test2 . 1table], not [test2 .1 table]. It is not known to have come
up in any real workload, as schema qualifiers are generally not used in
Skeema: they're never automatically included by dump-style commands (init,
pull, format) and if a human adds them manually a warning is emitted in most
cases. This was only found after seeing MDEV-39654 which describes the same
problem in MariaDB's Q1 releases.

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