Support basic ASCII characters in database names like underscore _

[edulix]

What would you like to be added or enhanced
Database names could be able to contain basic ASCII characters like underscore _ - perhaps also some other chars to be defined.

Why is this needed
Right now I've found no easy way to visually differentiate words in database names. Adding underscore will help. Table names and columns already support underscore.

Additional context
When creating a database name with underscore, you get punctuation marks and symbols are not allowed in database name.