[SQLParser] Add schema-name functionnality

[MobiliteDev]

SQLite can have a schema-name before some SQL command like SELECT or CREATE TABLE

This is the database alias used when you ATTACH a database.

Do you think SQLParser could be able to manage this property ?

[simolus3]

I think this should be possible, but it's a large effort. For what exactly do you need this? Are you using sqlparser directly to analyze queries? Do you need this feature in moor files?

[MobiliteDev]

We work on multiple databases on a single database connection. So we always prefix our queries with schema-name (even if only one database is connected: with schema-name "main." prefix).

We do not not need this feature in moor files, only for direct analyse.

[simolus3]

I've added support for this to the parser, the AST classes and the node-to-text formatter in aa75cbaa198e5e19f2e54dbcc0033aab47ba634a. I'll still have to work on proper analysis.