[WIP] feat(std): Add a Streamlike interface

[Etherian]

Description

Adds a Streamlike (name TBD) interface which generalizes the concept of a collection from which values can be extracted.

Related PRs

Similar concept to the Parsable interface (#687)

Status

In Development

Outstanding design questions:

None currently

To Do

• Add useful functions
• Add implementations for standard types
• Add inline documentation
• Add documentation in the book?

Prior Art

• Streaming library
• Iterators and Streams in Rust and Haskell.

Future Directions

• Streamlike + "Finite" -> Foldable (& Traversable)
• Build generic Streamlike instance for all Indexable? (i.e. [Indexable a] -> Streamlike a)
  • override-able for lists?
• Maybe a streaming library built like https://github.com/haskell-streaming/streaming, instead of this library's stream-processor-based design?
  • How would Streamlike adapters pass around Streamlikes? Rust-like? Haskell-like? Closure-based?