Add Create Room modal

[natalynyu]

This PR adds the Create Room modal, which allows users to create new rooms and buildings. The following rules apply to this modal:

• All of the fields in the Create Room modal are required, and errors should show up for each empty field when the user clicks submit.
• If the user tries to add a duplicate room, an error should be thrown indicating the room already exists.
• The capacity field must be a number.
• Changing the campus dropdown triggers the "Select existing building" dropdown to load data for the campus selected.
• If the user tries to add an existing building in the "New Building" field, an error should be thrown that redirects the user to select the building in the dropdown instead.
• If the user tries to specify a building that exists on a different campus, they should get an error, because buildings cannot exist on multiple campuses.
• When the user adds a new building, that building should appear in the dropdown when the modal is reopened and the campus that the building was created under is selected.
• When the modal opens, the focus should shift to the modal header, and when it closes, the focus should shift to the Create Room button.
• If a user alters at least 1 field in the modal and tries to exit the modal (either by clicking the Cancel button or clicking outside the modal), the should see an unsaved changes warning. If the user clicks "OK" in the unsaved changes dialog, the Create Room modal will close. If they click "cancel", the user can continue editing the modal.

Types of changes

• [ ] Bug fix (non-breaking change which fixes an issue)
• [x] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• [x] I have run eslint on the code
• [x] I have added JSDoc for all of my code (where applicable)
• [x] I have added tests to cover my changes.

Priority:

• [x] Normal
• [ ] High

Related Issues:

Fixes #568

[codecov[bot]]

Codecov Report

Merging #579 (651c875) into develop (645a2f4) will decrease coverage by 0.13%. The diff coverage is 91.80%.

@@             Coverage Diff             @@
##           develop     #579      +/-   ##
===========================================
- Coverage    95.94%   95.80%   -0.14%     
===========================================
  Files          187      189       +2     
  Lines         4414     4604     +190     
  Branches       572      596      +24     
===========================================
+ Hits          4235     4411     +176     
- Misses          92       99       +7     
- Partials        87       94       +7     

Impacted Files	Coverage Δ
src/client/context/MetadataContext.ts	82.60% <66.66%> (-17.40%)	:arrow_down:
src/server/location/location.controller.ts	93.75% <85.71%> (-6.25%)	:arrow_down:
src/server/location/location.service.ts	96.00% <92.00%> (-4.00%)	:arrow_down:
...ent/components/pages/RoomAdmin/CreateRoomModal.tsx	93.00% <93.00%> (ø)
src/client/api/rooms.ts	100.00% <100.00%> (ø)
...rc/client/components/pages/RoomAdmin/RoomAdmin.tsx	100.00% <100.00%> (ø)
src/common/dto/room/CreateRoomRequest.dto.ts	100.00% <100.00%> (ø)
.../components/pages/Schedule/blocks/SessionBlock.tsx	89.83% <0.00%> (-1.84%)	:arrow_down:
.../client/components/pages/Schedule/SchedulePage.tsx	96.90% <0.00%> (+0.75%)	:arrow_up:
...ent/components/pages/RoomSchedule/RoomSchedule.tsx	85.00% <0.00%> (+0.85%)	:arrow_up:
... and 1 more

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