feat: add component values iterator

[neuodev]

No description provided.

[emwalker]

LGTM with suggestion to not use "iterator" in the name unless this will become an actual iterator.

[emwalker]

I used the name "CharIterator," but that was just a placeholder. It was intended to be transitional until the time when I would be able to do

impl Iterator for CharIterator {
  type Item = bytes::Bytes;

  fn next(&mut self) -> Option<Self::Item> {
    // ...
  }
}

(This is what would make it a real iterator.)

I now have doubts that CharIterator will actually be a real iterator (implementing Iterator), and I'm guessing the name will change to something like BufferQueue. So I'd recommend not copying the the "Iterator" name unless it's an actual iterator. What you have here is more of a ValueBuffer or something. (There's probably a better name than ValueBuffer that will come to mind.)

[neuodev]

Yup, you are correct! I will rename it to ValueBuffer and about the CharIterator, I think we can also call it CharBuffer