Added alternative compile.to syntax, providing more efficient and uniform collection building

[mpilquist]

Fixes #1654

This PR introduces an overload of .compile.to that takes a Collector[O]. Best explained via usages:

s.compile.to(List)
s.compile.to(Array)
s.compile.to(Map)
s.compile.to(Chunk)
s.compile.to(ByteVector)

I deprecated .compile.{toMap, toChunk} as they aren't often used and their functionality is provided by the above. I left .compile.string b/c String doesn't have a companion object, making s.compile.to(String) impossible. I left toList and toVector undeprecated as they are used a lot and forcing folks to change syntax seemed hostile. Finally, I left .to[C] undeprecated because Scala's deprecation checker has a bug which flags uses of .to(collector) as deprecated calls despite only type param version being deprecated.

To build a custom collector, you can either implement CollectorK on the companion (like is done with Chunk in this PR), you can define an implicit conversion from the companion to a Collector (like done in this PR for Array) or you can define an explicit instance of Collector and require usage like .to(yourInstance).