Add IDENTIFIED in mysql keywords

[eeeXun]

Fix #691

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[eeeXun]

I see IDENTIFIED is in mysql keywords page. But not in mariadb keywords page.
Should I remove the change for mariadb? Although I think these two DBs are the same.

[nene]

MySQL docs list all keywords, but MariaDB docs only the reserved ones (marked by "(R)" in MySQL docs).

[nene]

As IDENTIFIED is not a reserved word, it can be freely used as an identifier. Simply adding it to the keywords array will result in a query like SELECT identified FROM foo to be formatted as SELECT IDENTIFIED FROM foo.

A better approach would be to add "IDENTIFIED BY" to the reservedPhrases array in *.formatter.ts files.

This also applies to SingleStoreDB dialect (which is also a close relative of MySQL).

[nene]

Thanks. Merged.