Fix/custom statement dependencies

[Alt-iOS]

This adds a custom_statement ordering for same resource custom statements (ie, a function before its trigger), makes after_tables mean only the table structure and renames after_tables to after_resources to better reflect that it means after the table and custom statements. Addresses #823

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• Update dependencies

[zachdaniel]

For ordering within statements, I think we could simply use the order that they appear in the resource. For after_resource, I think that is a confusingly named thing because multiple resources can share the same table. I'm still not fully convinced that we need it if after_tables is repurposed to just "after the table structure".

[Alt-iOS]

For the after_statements part, let me see if I can make it deterministic. The migration generator stopped preserving declaration order once one of the custom_statements had an after_tables dependency. I’ll see if I can preserve declaration order correctly in that case, which should remove the need for after_statements.

As for after_resource, the name is certainly a choice. I only suggested keeping the old behavior under another name because it was explicitly created for that purpose in the pr that added it. But it's only been in version 2.12.0 so I doubt many are using it, so f you don’t think that behavior needs to remain supported, I’ll remove it and clean up the old facts, comments, and tests in the next commit.

[Alt-iOS]

@zachdaniel Pushed deleting the after_statements and after_resource, now this

custom_statements do
  statement :create_function do
    after_tables ["audit_entries"]
    up "CREATE FUNCTION ..."
    down "DROP FUNCTION ..."
  end

  statement :create_trigger do
    up "CREATE TRIGGER ... EXECUTE FUNCTION ..."
    down "DROP TRIGGER ..."
  end
end

Creates this migration order

create widgets table structure
create audit_entries table structure
create function
create trigger

[zachdaniel]

🚀 Thank you for your contribution! 🚀