Python3.11 compatibility

[stephanelsmith]

Reason for the change
Python3.11 compatibility issues with running

Description
"@asyncio.coroutine" and "yield from" syntax no longer allowed in 3.11. Changed to "async" and "await" respectively.

Code examples
For example, changes made like this:

@asyncio.coroutine        <<<<-- REMOVED
async def _read_until(streamreader, delimiter): <<<<--- ADDED
    """Naive implementation of reading until a delimiter"""
    buffer = bytearray()
    while True:
        # c = yield from streamreader.read(1)  <<<<<<-- REMOVED
        c = await streamreader.read(1)   <<<<<< -- ADDED
        if c == b"":
            break  # EOF
        buffer.append(c[0])
        if c == delimiter:
            break
    return bytes(buffer)

Checklist

• I have read and agreed to the RethinkDB Contributor License Agreement

References
I have a number of compatibility updates, made some for 3.10 as well last year. I wanted decreased verbosity in the export.
Happy to cherry pick what makes sense, but would like to see continued support track with Python versions.

[codeclimate]

Similar blocks of code found in 2 locations. Consider refactoring.

[codeclimate]

Similar blocks of code found in 2 locations. Consider refactoring.

[codeclimate]

Code Climate has analyzed commit 041dc5d and detected 2 issues on this pull request.

Here's the issue category breakdown:

Category	Count
Duplication	2

View more on Code Climate.

[stephanelsmith]

Apologize for closing/opening. Confirming my verison is working in my 3.11 appliction. Happy to help cherry pick these changes into mainline, but definitely think updates are necessary for continued python support. Love this project, show must go on!

[lsabi]

Closing as it has been integrated from another PR #298

@stephanelsmith thanks for the support!