5pm c avg class size by dept

[paritoshjha24]

This PR implements the "Average Class Size by Department" statistics page, where a user can select a start and end quarter and view the average class size for all departments (including Undergraduate and Graduate courses) over that range of time. Closes #46

Before:

After:

[codecov]

Codecov Report

Merging #76 (9fce7d4) into main (2dbd09a) will not change coverage.
The diff coverage is 100.00%.

@@             Coverage Diff             @@
##                main       #76   +/-   ##
===========================================
  Coverage     100.00%   100.00%           
- Complexity       288       302   +14     
===========================================
  Files             54        61    +7     
  Lines            850       943   +93     
  Branches          20        21    +1     
===========================================
+ Hits             850       943   +93     

Impacted Files	Coverage Δ	Complexity Δ
javascript/src/main/App.js	100.00% <ø> (ø)	0.00 <0.00> (ø)
javascript/src/main/components/Nav/AppNavbar.js	100.00% <ø> (ø)	0.00 <0.00> (ø)
...pt/src/main/components/Statistics/ClassSizeForm.js	100.00% <100.00%> (ø)	0.00 <0.00> (?)
...t/src/main/components/Statistics/ClassSizeTable.js	100.00% <100.00%> (ø)	0.00 <0.00> (?)
...main/components/Statistics/DepartmentFormSelect.js	100.00% <100.00%> (ø)	0.00 <0.00> (?)
...rc/main/components/Statistics/QuarterFormSelect.js	100.00% <100.00%> (ø)	0.00 <0.00> (?)
javascript/src/main/pages/Statistics/ClassSize.js	100.00% <100.00%> (ø)	0.00 <0.00> (?)
javascript/src/main/services/statisticsService.js	100.00% <100.00%> (ø)	0.00 <0.00> (?)
...ucsb/courses/controllers/StatisticsController.java	100.00% <100.00%> (ø)	3.00 <1.00> (+1.00)
...csb/courses/documents/statistics/AvgClassSize.java	100.00% <100.00%> (ø)	13.00 <13.00> (?)
... and 7 more

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[jvoucsb]

Deployed locally and found no bugs.

There is one change needed and one to consider. Other than that, looks good to me.

[hdinh77]

besides the changes about PORT that justin mentioned (this is more for a local user that needs to use a different port), looks good!

[jvoucsb]

Quick fix. But otherwise, looks good to me.

[phtcon]

LGTM. 40 points