This is a followup to #2867
Some of the literals used in the test cases were too big to fit in an
Int32
This is fine on 64-bit systems, because the literals are considered as
`Int`, which is Int64 on those systems
However, on 32-bit systems, those literals are considered as Int64
Change: Add `as Int64` where needed, to tell the compiler we want these
literals to be treated as Int64, which should allow these tests to run
on 32 bit systems too
Add functions for reading and writing length-prefixed data with
customizable encodings for the length, particularly for quic
variable-length integers (RFC 9000)
### Motivation:
Many protocols require us to write data and then prefix that data with
its length. But each protocol has a different way of encoding the
length. This PR introduces general purpose functions which can be
extended for different encoding strategies
### Modifications:
Create a new protocol which defines how to encode an integer
Implement this protocol for QUIC
Provide functions on bytebuffer for writing length-prefixed buffers,
strings or bytes
hamzahrmalik