Restructuring

[kmpaul]

This PR:

1. restructures the code to add functional initialization of the app,
2. breaks out functional elements into their own modules (views, middleware, etc.), and
3. adds testing.

The tests could not be done with fastapi.testing.TestClient. It turns out that there is an open bug in Starlette that has been open for over a year (encode/starlette#472), which prevents mixing middleware and Jinja2 TemplateResponse object together. The code works fine, but the unit testing fails with FastAPI's TestClient. The workaround (fastapi/fastapi#806) is to use the async-asgi-testclient package for testing.

[codecov]

Codecov Report

Merging #7 into master will increase coverage by 10.20%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##           master        #7       +/-   ##
============================================
+ Coverage   89.79%   100.00%   +10.20%     
============================================
  Files           2         6        +4     
  Lines          49        95       +46     
============================================
+ Hits           44        95       +51     
+ Misses          5         0        -5     

Impacted Files	Coverage Δ
tests/test_middleware.py	100.00% <100.00%> (ø)
tests/test_views.py	100.00% <100.00%> (ø)
xdevbot/__init__.py	100.00% <100.00%> (+23.80%)	⬆️
xdevbot/initialization.py	100.00% <100.00%> (ø)
xdevbot/middleware.py	100.00% <100.00%> (ø)
xdevbot/views.py	100.00% <100.00%> (ø)
... and 1 more

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