Add new endpoint for Copy timetable feature

[evansiroky]

See https://github.com/conveyal/analysis-ui/pull/682

[codecov-io]

Codecov Report

Merging #137 into dev will increase coverage by 4.1%. The diff coverage is 97.72%.

@@            Coverage Diff             @@
##               dev     #137     +/-   ##
==========================================
+ Coverage     15.5%   19.61%   +4.1%     
- Complexity      48       90     +42     
==========================================
  Files           57       58      +1     
  Lines         2044     2452    +408     
  Branches       179      250     +71     
==========================================
+ Hits           317      481    +164     
- Misses        1708     1945    +237     
- Partials        19       26      +7

Impacted Files	Coverage Δ	Complexity Δ
...rc/main/java/com/conveyal/taui/AnalysisServer.java	46.96% <100%> (+6.37%)	6 <0> (+2)	:arrow_up:
...n/java/com/conveyal/taui/AnalysisServerConfig.java	75% <100%> (ø)	5 <0> (+2)	:arrow_up:
...conveyal/taui/controllers/TimetableController.java	97.61% <97.61%> (ø)	10 <10> (?)
.../java/com/conveyal/taui/analysis/LocalCluster.java	92.59% <0%> (-7.41%)	2% <0%> (ø)
...om/conveyal/taui/controllers/WorkerController.java	31.65% <0%> (-1.19%)	12% <0%> (+6%)
.../conveyal/taui/analysis/broker/RedeliveryTest.java	0% <0%> (ø)	0% <0%> (ø)	:arrow_down:
...ava/com/conveyal/taui/models/ModificationStop.java	0% <0%> (ø)	0% <0%> (ø)	:arrow_down:
...a/com/conveyal/taui/analysis/broker/JobStatus.java	0% <0%> (ø)	0% <0%> (ø)	:arrow_down:
...in/java/com/conveyal/taui/analysis/broker/Job.java	0% <0%> (ø)	0% <0%> (ø)	:arrow_down:
... and 13 more

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