add support multiple alter in alter table statement

[bchelli]

🚨🚨🚨 BREAKING CHANGE 🚨🚨🚨

This is breaking the AST interface for the alter table statement

• change becomes changes (with a "s") and is an array of table alterations (TableAlteration[])

This is a PR to address the following issues:

• [ALTER TABLE] Support parsing multiple alterations #57
• Support ALTER TABLE with multiple entries pg-mem#85

[oguimbal]

Rien à redire :)

Thanks a lot !

[oguimbal]

Released as [email protected] !

[oguimbal]

@bchelli Just in case you were planning to implement the pg-mem part 👉 You will have very hard time to do so, since pg-mem still uses pgsql-ast-parser v7... a refactoring is still ongoing to implement the v8 breaking changes.

I'm almost finished, I will push that asap