v6: NearObject, Near<Media>, and Hybrid queries

[bevzzz]

This PR adds support for NearObject, Near, and Hybrid operators in query and aggregate namespaces.

final var things = client.collections.use("Things");

things.query.hybrid("something like that", q -> q.alpha(0.3f).fusionType(Hybrid.FusionType.RANKED));

// .excludeSelf is a shorthand for `where(Where.uuid().ne("this-thing-id"))`
things.query.nearObject("this-thing-id", q -> q.excludeSelf());

There's also some minor improvements to Where-filter builders:

• Where.uuid() is a shorthand for Where.property("_id")
• Where::toString now prints human-readable representation of the filter

Where.reference("hasFriend", "name").eq("Piglet")`
// Outputs:
//   "Where(hasFriend::name Equal Piglet)"

• Calls to .where(...) can now be chained -- individual conditions will be AND'ed together

query -> query.where(Where.and(
  Where.property("name").eq("pooh"),
  Where.property("age").gte(22)
))

// is equivalent to

query -> query
  .where(Where.property("name").eq("pooh")
  .where(Where.property("age").gte(22)

[orca-security-eu]

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