Improve performance on metadata computation (#12785)

In this PR:

## Improve recompute metadata cache performance. We are aiming for
~100ms

Deleting relationMetadata table and FKs pointing on it
Fetching indexMetadata and indexFieldMetadata in a separate query as
typeorm is suboptimizing

## Remove caching lock

As recomputing the metadata cache is lighter, we try to stop preventing
multiple concurrent computations. This also simplifies interfaces

## Introduce self recovery mecanisms to recompute cache automatically if
corrupted

Aka getFreshObjectMetadataMaps

## custom object resolver performance improvement:  1sec to 200ms

Double check queries and indexes used while creating a custom object
Remove the queries to db to use the cached objectMetadataMap

## reduce objectMetadataMaps to 500kb
<img width="222" alt="image"
src="https://github.com/user-attachments/assets/2370dc80-49b6-4b63-8d5e-30c5ebdaa062"
/>

We used to stored 3 fieldMetadataMaps (byId, byName, byJoinColumnName).
While this is great for devXP, this is not great for performances.
Using the same mecanisme as for objectMetadataMap: we only keep byIdMap
and introduce two otherMaps to idByName, idByJoinColumnName to make the
bridge

## Add dataloader on IndexMetadata (aka indexMetadataList in the API)

## Improve field resolver performances too

## Deprecate ClientConfig

packages/twenty-server/src/engine/metadata-modules/utils/__tests__/validate-field-name-availability.spec.ts

@@ -6,7 +6,7 @@ import {
   FIELD_CURRENCY_MOCK_NAME,
   FIELD_FULL_NAME_MOCK_NAME,
   FIELD_LINKS_MOCK_NAME,
-  objectMetadataItemMock,
+  objectMetadataMapItemMock,
 } from 'src/engine/api/__mocks__/object-metadata-item.mock';
 import { validateFieldNameAvailabilityOrThrow } from 'src/engine/metadata-modules/utils/validate-field-name-availability.utils';
 
@@ -57,18 +57,22 @@ const validateFieldNameAvailabilityTestCases: ValidateFieldNameAvailabilityTestC
   ];
 
 describe('validateFieldNameAvailabilityOrThrow', () => {
-  const objectMetadata = objectMetadataItemMock;
-
   it.each(validateFieldNameAvailabilityTestCases)(
     '$title',
     ({ context: { input, shouldNotThrow } }) => {
       if (shouldNotThrow) {
         expect(() =>
-          validateFieldNameAvailabilityOrThrow(input, objectMetadata),
+          validateFieldNameAvailabilityOrThrow(
+            input,
+            objectMetadataMapItemMock,
+          ),
         ).not.toThrow();
       } else {
         expect(() =>
-          validateFieldNameAvailabilityOrThrow(input, objectMetadata),
+          validateFieldNameAvailabilityOrThrow(
+            input,
+            objectMetadataMapItemMock,
+          ),
         ).toThrowErrorMatchingSnapshot();
       }
     },