Subset search functions for native cube views

[MariusWirtz]

It would be nice to have search functions in the ViewService to find all views that reference a subset.

Kinda similar to the search functions in the ProcessService

tm1py/TM1py/Services/ProcessService.py

Line 93 in 7358f7b

def search_string_in_code(self, search_string: str, skip_control_processes: bool=False, **kwargs) -> List[str]:

[MariusWirtz]

closed with #752