Add server pooling

[SamuelWei]

Fixes #96

Type (Highlight the corresponding type)

• Bugfix
• Feature
• Documentation
• Refactoring (e.g. Style updates, Test implementation, etc.)
• Other (please describe):

Checklist

• Code updated to current masters head
• Passes CI checks
• Is a part of an issue
• Tests added for the bugfix or newly implemented feature, describe below why if not
• Changelog is updated
• Documentation of code and features exists

Changes

• Added server pools
• Added attribute name to servers
• Added server pools to room types
• Changed load balancer to only use servers from the server pool of the room's room type
• Adjusted tests

Other information

[codecov]

Codecov Report

Merging #99 (77a34b2) into master (ed9642a) will increase coverage by 0.92%.
The diff coverage is 95.37%.

@@             Coverage Diff              @@
##             master      #99      +/-   ##
============================================
+ Coverage     85.54%   86.47%   +0.92%     
- Complexity      426      456      +30     
============================================
  Files           131      139       +8     
  Lines          2401     2610     +209     
  Branches        150      163      +13     
============================================
+ Hits           2054     2257     +203     
- Misses          292      294       +2     
- Partials         55       59       +4     

Impacted Files	Coverage Δ	Complexity Δ
resources/js/views/rooms/View.vue	35.05% <ø> (ø)	0.00 <0.00> (ø)
resources/js/views/settings/servers/View.vue	92.53% <ø> (ø)	0.00 <0.00> (ø)
app/Server.php	93.04% <50.00%> (-0.24%)	33.00 <2.00> (-1.00)
resources/js/router.js	81.42% <77.77%> (-0.54%)	0.00 <0.00> (ø)
resources/js/views/settings/serverPools/Index.vue	92.50% <92.50%> (ø)	0.00 <0.00> (?)
resources/js/views/settings/serverPools/View.vue	93.87% <93.87%> (ø)	0.00 <0.00> (?)
resources/js/views/settings/roomTypes/View.vue	94.11% <95.83%> (+4.92%)	0.00 <0.00> (ø)
app/Http/Controllers/api/v1/RoomController.php	99.05% <100.00%> (ø)	29.00 <0.00> (ø)
app/Http/Controllers/api/v1/RoomTypeController.php	100.00% <100.00%> (ø)	8.00 <0.00> (ø)
app/Http/Controllers/api/v1/ServerController.php	100.00% <100.00%> (ø)	22.00 <0.00> (ø)
... and 21 more

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