fix(types): override types deep merge

[avallete]

Upgrading supabase-js and trying things out in our own repository, I spotted some bugs with the way the merging was done for some cases notably:

1. The properties weren't properly overwrote by the new value if it existed in the original ( that's on me for not writing this basic test 😓)
2. If we wanted to override a "nullable object" such as one within a json field, it wasn't possible to do so without re-writing the whole object, instead of just the property we wanted. This has been changed and now we'll deep-merge and rely on the new casted type to know if we must preserve the optionality or not.
3. Related to 2 but for relations (such as inner) or embeded arrays relationships, it wasn't possible to override the type of one property in the embeded tables. This is now possible by checking if both old and new values property are arrays, and if that's the case, merging the type of those arrays togethers. Otherwise, the new value will take over and replace the old one.

[github-actions]

🎉 This PR is included in version 1.19.1 🎉

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• GitHub release
• npm package (@latest dist-tag)

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