Handle where filter for prisma relations

[foyarash]

For prisma, allows the following where filter

{"posts.title": {"$cont": "Hello"}}

to

{
  posts: {
    some: {
      title: {
        contains: "Hello"
      }
    }
  }
}

This works when adding the relation to the manyRelations field of the PrismaAdapter, like so: manyRelations: ['posts']

[zuhair-naqvi]

Anything blocking merging this PR?