Feat: correct type hints

[Equipo45]

Description

Correct some type-hints in transcribe.py and vad.py files. The majority of the changes are in transcribe.py. The idea is to make it easier to understand and maintain in the future.
Did you consider creating data classes for more function returns, or can it be overwhelming?

Two type hints could be more problematic, I didn't touch them because it could change the transcribe logic, breaking it:

• Here a dict is introduced and is expected to be a list of dicts:
  merge_punctuations(alignment, prepend_punctuations, append_punctuations)
• Here a list of dicts is expected, but a list of list is introduced, but with a list of list the function shouldn't work...

if options.word_timestamps:
                self.add_word_timestamps(
                    [current_segments],

PD:
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