refactoring (#13)

* general project refactoring

* various small improvements

* improve imap fixture with helper functions and typing

* add wordpress send email setup

* add wordpress receive email test

* add various documentation

Reviewed-on: local-it-infrastructure/e2e_tests#13
Co-authored-by: Daniel <d.brummerloh@gmail.com>
Co-committed-by: Daniel <d.brummerloh@gmail.com>

prototyping/dependency_injection.py

@@ -0,0 +1,19 @@
+import inspect
+
+a = 2
+b = 3
+c = 4
+
+
+def func(a: int, c: int) -> int:
+    return a + c
+
+
+arg_names = inspect.getfullargspec(func).args
+print(arg_names)  # ['a', 'c']
+
+arguments = {arg: globals()[arg] for arg in arg_names if arg in globals()}
+print(arguments)  # {'a': 2, 'c': 4}
+
+result = func(**arguments)
+print(result)  # 6