feat(db-postgres): deep querying on json and rich text fields (#9102)

### What?
Allows to query on JSON / Rich Text fields in Postgres the same way as
in Mongodb with any nesting level.

Example:
Data:
```js
{
  json: {
    array: [
      {
        text: 'some-text', // nested to array + object
        object: {
          text: 'deep-text', // nested to array + 2x object
          array: [10], // number is nested to array + 2x object + array
        },
      },
    ],
  }
}
```
Query:
```ts
payload.find({
  collection: 'json-fields',
  where: {
    and: [
      {
        'json.array.text': {
          equals: 'some-text',
        },
      },
      {
        'json.array.object.text': {
          equals: 'deep-text',
        },
      },
      {
        'json.array.object.array': {
          in: [10, 20],
        },
      },
      {
        'json.array.object.array': {
          exists: true,
        },
      },
      {
        'json.array.object.notexists': {
          exists: false,
        },
      },
    ],
  },
})
```

### How?
Utilizes [the `jsonb_path_exists` postgres
function](https://www.postgresql.org/docs/current/functions-json.html)

test/fields/payload-types.ts

@@ -1183,6 +1183,13 @@ export interface IndexedField {
 export interface JsonField {
   id: string;
   json?: {
+    array?: {
+      object?: {
+        array?: number[];
+        text?: string;
+      };
+      text?: string;
+    }[];
     foo?: 'bar' | 'foobar';
     number?: 10 | 5;
     [k: string]: unknown;