Reliably sort functions, views, and materialized views in schema

[danielwestendorf]

Dependent on #180

• sorts functions when dumping schema for consistent schema changes
• reliably sorts views and materialized views in schema

Previously, functions where dumped in an unsorted fashion, resulting in changes to the schema when no actual changes where made.

Previously, views and materialized views were reliably placed after tables, however, a sorted order of those views was not enforced so the order of the views would change when no actual changes where made.

[franzliedke]

@danielwestendorf Is this going to work reliably for views dependent on each other? 🤔