Sanic multi-application server

[ahopkins]

Implementation of #2348

app.prepare(port=9999, debug=True)
app.prepare(port=9998)
app.prepare(port=9997)
app2.prepare(port=8888)
app2.prepare(port=8887)

Sanic.serve()

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Requires #2362

BREAKING CHANGES 🚨

• Removes GunicornWorker completely without a deprecation period

SIDE EFFECTS 🧁

• Allows named tasks even in Python 3.7

NOTES 📝

• auto_reload will be enabled if ANY of the applications are prepared with it on
• workers are bound by the primary application (the first one prepared)

[codecov]

Codecov Report

Merging #2347 (14fbe97) into main (8dfa49b) will increase coverage by 0.909%.
The diff coverage is 94.237%.

@@              Coverage Diff              @@
##              main     #2347       +/-   ##
=============================================
+ Coverage   86.248%   87.157%   +0.909%     
=============================================
  Files           60        60               
  Lines         5003      4999        -4     
  Branches       896       904        +8     
=============================================
+ Hits          4315      4357       +42     
+ Misses         502       471       -31     
+ Partials       186       171       -15     

Impacted Files	Coverage Δ
sanic/request.py	96.187% <ø> (ø)
sanic/server/protocols/base_protocol.py	65.384% <ø> (+1.634%)	⬆️
sanic/server/protocols/http_protocol.py	88.095% <ø> (+4.374%)	⬆️
sanic/server/protocols/websocket_protocol.py	70.312% <ø> (+2.130%)	⬆️
sanic/app.py	88.910% <72.222%> (+2.273%)	⬆️
sanic/mixins/runner.py	94.893% <94.893%> (ø)
sanic/application/state.py	96.103% <100.000%> (+3.121%)	⬆️
sanic/models/server_types.py	97.297% <100.000%> (+0.075%)	⬆️
sanic/server/runners.py	90.370% <100.000%> (ø)
sanic/touchup/schemes/ode.py	93.846% <100.000%> (-0.032%)	⬇️
... and 7 more

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[vltr]

I think this will be awesome, a huge step forward the right direction! 😎