Support SKIP LOCKED and NOWAIT

• Support SKIP LOCKED and NOWAIT #129

Multiple statements in alter tables

Thanks to @bchelli via his PR #60 and @clemens-smartparking via this PR

🚨🚨🚨 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:

• #57
• oguimbal/pg-mem#85
• oguimbal/pg-mem#117

8.0.0

Breaking changes

• This release has one major breaking change:

INSERT [...] statements were parsed as an InsertStatment having a values property when parsing an insert ... values ..., or a select property when parsing an insert ... select ....

Given that the VALUES (...) is now handled as a statement (yes, it is a valid pgsql statement...Try it !), the INSERT statement is now parsed with a single insert property, wether it is an insert ... values or an insert ... select (see ast diff)

• "default" keyword is now handled as an expression

Other changes

• Handle "restart identity" on trucation thanks to @RafaelGSS (see his PR)