Refactor graphql query runner and add mutation resolvers (#7418)

Fixes https://github.com/twentyhq/twenty/issues/6859

This PR adds all the remaining resolvers for
- updateOne/updateMany
- createOne/createMany
- deleteOne/deleteMany
- destroyOne
- restoreMany

Also
- refactored the graphql-query-runner to be able to add other resolvers
without too much boilerplate.
- add missing events that were not sent anymore as well as webhooks
- make resolver injectable so they can inject other services as well
- use objectMetadataMap from cache instead of computing it multiple time
- various fixes (mutation not correctly parsing JSON, relationHelper
fetching data with empty ids set, ...)

Next steps: 
- Wrapping query builder to handle DB events properly
- Move webhook emitters to db event listener
- Add pagination where it's missing (findDuplicates, nested relations,
etc...)

packages/twenty-server/src/engine/metadata-modules/index-metadata/index-metadata.entity.ts

@@ -60,8 +60,8 @@ export class IndexMetadataEntity {
   @Column({
     type: 'enum',
     enum: IndexType,
-    nullable: true,
     default: IndexType.BTREE,
+    nullable: false,
   })
   indexType?: IndexType;
 }