refactor: introduce todos selectors

[timdeschryver]

What:

• introduce todos selectors (and the async pipe)
• Rewrite tests using @angular-extensions/testing-library

Issue number: N/A

[codecov-io]

Codecov Report

Merging #414 into master will increase coverage by 28.15%. The diff coverage is 94.11%.

@@             Coverage Diff             @@
##           master     #414       +/-   ##
===========================================
+ Coverage   58.77%   86.92%   +28.15%     
===========================================
  Files          66       66               
  Lines        1043     1048        +5     
  Branches       46       46               
===========================================
+ Hits          613      911      +298     
+ Misses        424      120      -304     
- Partials        6       17       +11

Impacted Files	Coverage Δ
...ples/todos/components/todos-container.component.ts	96.36% <100%> (+59.26%)	:arrow_up:
...app/shared/big-input/big-input-action.component.ts	100% <100%> (+15.38%)	:arrow_up:
src/app/examples/todos/todos.selectors.ts	93.33% <91.66%> (+18.33%)	:arrow_up:
src/app/core/core.module.ts	88.88% <0%> (+3.7%)	:arrow_up:
src/app/examples/form/components/form.component.ts	80.48% <0%> (+7.31%)	:arrow_up:
src/app/examples/crud/books.selectors.ts	90.9% <0%> (+9.09%)	:arrow_up:
src/app/examples/form/form.actions.ts	100% <0%> (+10%)	:arrow_up:
...otifications/components/notifications.component.ts	72.22% <0%> (+11.11%)	:arrow_up:
src/app/core/animations/route.animations.ts	87.5% <0%> (+12.5%)	:arrow_up:
src/app/shared/big-input/big-input.component.ts	100% <0%> (+14.28%)	:arrow_up:
... and 38 more

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