Library totalSize overwritten when using search with libtype

[JonnyWong16]

Describe the issue
The library cached _total_size value is overwritten when using search with a different libtype than the main library type.

https://github.com/pkkid/python-plexapi/blob/4.4.1/plexapi/library.py#L380

This causes the totalSize property to return the cached value instead of the correct value.

https://github.com/pkkid/python-plexapi/blob/4.4.1/plexapi/library.py#L393

Code snipppets

>>> library = plex.library.section("TV Shows")
>>> print(library.totalSize)
2  # This is the number of TV Shows in the library
>>> library.searchEpisodes()  # This calls library.search(libtype='episode')
>>> print(library.totalSize)
51  # This is now the number of episodes in the library.

Expected behavior
Library totalSize should always be the number of items of the main library type (i.e. number of shows).

Enviroment (please complete the following information):

• PlexAPI version: 4.4.1

[Hellowlol]

This isn't a bug it's intended... But the name is awful. I should have used different name as its pretty misleading. A better name would be total_view_size or something like that. This is used in the library.search to make search flexible and efficient. We should change it.

[JonnyWong16]

totalSize should cache to _totalSize which is independant from fetchItems.

Search should use a completely separate cached _totalViewSize which is used in fetchItems.