Support create table DEC parse

[zihaoAK47]

Fixes #27325.

Changes proposed in this pull request:

• Support create table DEC parse
• Add test sql

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[zihaoAK47]

https://dev.mysql.com/doc/refman/8.0/en/numeric-type-syntax.html
https://github.com/mysql/mysql-server/blob/trunk/sql/lex.h#L195