Added filters to take more than one filter parameters, enabled empty filter params, changed campus parameters

[djennedy]

Added filter functions that now take more than one filter parameter as a list.

The filters that can take more than one filter parameter:

• Filter by Levels
• Filter by Campuses
• Filter by WQB Designations

All of these filters have checkbox parameters so we be able to filter with more than one parameter. They also take empty lists as a no-filters option

The filters that doesn't take more than one filter parameters:

• Filter by Instructor
• Filter by Credits

Both of these filters are text input from the user so it doesn't make sense to have more than one filter parameter

Chaining all of these filters work with each other, for example, I tested:

let testTerm = getTermInfo("Spring 2023", ["cmpt", "cmns", "ca"])
testTerm.then(termInfoList => filterByCredits(filterByCampuses(filterByWqbs(filterByLevels(filterByInstructor(termInfoList, ""),[100,200,300]),["w"]),["Burnaby"]), 4))

I also made a change for campus filtering, now instead of taking a "Vancouver" option, the checkbox will show "Online" and "Other" instead. Reasoning is because there are multiple Vancouver campuses and all of them are encoded differently in the API, so we'd rather just bunch them together than deal with edge cases one by one

[sarah-vo]

LGTM 🫡