Integrate relations for remote objects (#4754)

Foreign table id cannot be a foreign key of a base table. But the
current code use foreign keys to link object metadata with activities,
events... So we will:
- create a column without creating a foreign key
- add a comment on the table schema so pg_graphql sees it as a foreign
key

This PR:
- refactor a bit object metadata service so the mutation creation is
separated into an util
- adds the mutation creation for remote object relations
- add a new type of mutation to create a comment

---------

Co-authored-by: Thomas Trompette <thomast@twenty.com>

packages/twenty-server/src/engine/metadata-modules/remote-server/utils/validate-remote-server-input.ts

@@ -1,4 +1,4 @@
-const INPUT_REGEX = /^([A-Za-z0-9\-\_]+)$/;
+const INPUT_REGEX = /^([A-Za-z0-9\-\_\.]+)$/;
 
 export const validateObject = (input: object) => {
   for (const [key, value] of Object.entries(input)) {