Add better support for receiving larger payloads

[asonix]

PR Type

Feature

PR Checklist

• [x] Tests for the changes have been added / updated. (if updating the chat example counts)
• [x] Documentation comments have been added / updated.
• [x] A changelog entry has been made for the appropriate packages.
• [x] Format code with the nightly rustfmt (cargo +nightly fmt).

Overview

This change enables the maximum frame size to be configured when receiving websocket frames. It also adds a new stream time that aggregates continuation frames together into their proper collected representation. It provides no mechanism yet for sending continuations.