task generator improvements

[LimingXuIHME]

After discussing with Adam, we added these features to the task generator:

• The task template has each method input as a separate node arg;
• The task generator with method of list type input takes various length lists;
• Add new "create_tasks" method to create array tasks

Add test cases to cover the above, and mocked the fhs_task_generator in the tests.

Add documentation in QuickStart.

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Coverage report

Click to see where and how coverage changed

File	Statements	Missing	Coverage	Coverage (new stmts)	Lines missing
jobmon_client/src/jobmon/client
workflow.py					90
jobmon_core/src/jobmon/core
task_generator.py					168-172, 307-310, 416-419, 456-491, 517-522, 561-589, 594-608, 620
jobmon_core/src/jobmon/worker_node
cli.py					117-122
Project Total

This report was generated by python-coverage-comment-action

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Test Results

0 tests  ±0   0 :white_check_mark: ±0   0s :stopwatch: ±0s 0 suites ±0   0 :zzz: ±0  0 files   ±0   0 :x: ±0 

Results for commit 9519568d. ± Comparison against base commit eebdfdff.

:recycle: This comment has been updated with latest results.