fix(protocol): Fix a bug in BytesReader.peek()

 - An invalid constant was used when determining
 the `TypeToken` for an empty array/object
 - Replace the `Deque<Integer>` usage in `BytesReader`
 with a bare-bones stack implementation (`IntStack`)
 to reduce boxing/unboxing overhead
 - Extract common binary protocol constants in `Protocol`

Author: Georgi Neykov