async mode for multiple port support

[rudyvan]

Link to code

No response

Proposal

the async example provided works for a single application mode (syntax modified for latest release where return_async_server is obsolete):

import asyncio

import uvloop

from sanic import Sanic, response

app = Sanic("Example")

@app.route("/")
async def test(request):
    return response.json({"answer": "42"})

async def main():
    server = await app.create_server(
        port=8000, host="0.0.0.0")

    if server is None:
        return

    await server.startup()
    await server.serve_forever()

if __name__ == "__main__":
    asyncio.set_event_loop(uvloop.new_event_loop())
    asyncio.run(main())

how to make this work for a situation where you have to serve multiple ports?
only main() has to change:

async def main():
    server1 = await app.create_server(port=8000, host="0.0.0.0")
    server2 = await app.create_server(port=8080, host="0.0.0.0")

    if any(server is None for server in [server1, server2]):
        return

    await asyncio.gather(*[server1.startup(), server2.startup()])
    await server2.serve_forever()

The above code does not work, nor any other combination.
What is the right way to start the 2 async servers?
Can the example be updated for 2 ports?

Additional context

No response

Is this a breaking change?

• Yes