Re-enable typechecking for modules

[PicoCentauri]

In #524 we had to disable the type checking for all modules because the means and sems of the _obs dictionary have no clear types.

We should set these types in a better way and re-enable the checker with mypy. I think the propper way is that each module has to define it's observables and we do not try to guess a complicated try-except block:

maicos/src/maicos/core/base.py

Lines 477 to 491 in b6097db

	# This try/except block is used because it will fail only once and is
	# therefore not a performance issue like a if statement would be.
	try:
	# Fail fast if the means and sems are not defined yet.
	self.means # type: ignore # noqa B018
	self.sems # type: ignore # noqa B018
	# Take the data from the current frame and update the means and sems
	for key in self._obs:
	# Sanitize the data type of the observable
	if isinstance(self._obs[key], list):
	self._obs[key] = np.array(self._obs[key])
	if key not in self._pop:
	# Observable is a single sample, so _pop is 1 and _var is 0
	self._pop[key] = np.ones(np.shape(self._obs[key]), dtype=int)

Originally posted by @PicoCentauri in #524 (comment)