Import .sql files

[Pierre]

For project setup we oftenly need a file import procedure.

Difficulty resides in the fact that we need to parse the file, taking care of escape sequences and split file using the ; separator into a list of SQL commands.

Ideally:

• Split file using the ; separator, while preserving those in escape sequences, this must depend upon the driver because each SQL dialect has its own escape sequences.
• Cleanup lines and remove end of lines that start with --.
• Some SQL servers also consider comments starting with // or being enclosed in /* */, handle that as well.
• Remove cleanup statements that end up being empty.
• Ideally, do this without storing the file into memory, stream parsing and execute statements as we go.
• The import file parser must be agnostic of what's consuming it, a callable should be provided to handle statements.
• Write a command for parsing a file and outputing using a normalized output, for debugging.