Basic support for TypedDicts (PEP 589)

[ilai-deutel]

#129 added support for type hinting-based docs. This adds basic support for TypedDicts, which were not supported because of their type.

Example:

from sanic import Sanic
from sanic_openapi import doc, swagger_blueprint
from typing_extensions import TypedDict

app = Sanic()
app.blueprint(swagger_blueprint)

class Car(TypedDict):
    make: str
    model: str

@app.get("/car/<id:int>")
@doc.summary("Gets a car")
@doc.produces(Car)
async def get_car(request, car_id):
    car: Car = {"make": "Nissan", "model": "370Z"}
    # Alternative syntax: car = Car(make="Nissan", model="370Z")
    return json(car)

if __name__ == '__main__':
    app.run(host='0.0.0.0', port=8000)

TypedDict inheritance works, as well as Nested TypedDicts.

This PR provides basic support for TypedDict. Full support should probably analyze the totality of the TypedDict and set required to True or False accordingly.

[codecov-io]

Codecov Report

Merging #134 into master will not change coverage.
The diff coverage is 100%.

@@           Coverage Diff           @@
##           master     #134   +/-   ##
=======================================
  Coverage   95.56%   95.56%           
=======================================
  Files           4        4           
  Lines         451      451           
  Branches       95       95           
=======================================
  Hits          431      431           
  Misses          6        6           
  Partials       14       14

Impacted Files	Coverage Δ
sanic_openapi/doc.py	100% <100%> (ø)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update ee640f2...9cbd2ba. Read the comment docs.

[viniciusd]

Neat :)

I am all in on adding that to #128, making that issue a tracking issue for the complete type hinting support

[chenjr0719]

LGTM