Added GlueJob.wait_for_completion()

[xoen]

GlueJob.wait_for_completion() allows the client code to poll for the Glue Job status until the job "completed" or failed.

By completed here we mean the job run was successful or it was manually stopped.

In addition to this, if a job failed or timed out the method will raise an exception (JobFailed and JobTimedOut respectively)

Also:

• Added GlueJob.cleanup() and deprecated low level methods GlueJob.delete_job() and GlueJob. delete_s3_job_temp_folder()
• fixed import order as per PEP8

[xoen]

Speaking of style, what I've found useful in other places is to have VS code to auto format python using black so I don't have to spend too much mental energy on how to format code. An idea for the future maybe.

[codecov-io]

Codecov Report

Merging #49 into master will decrease coverage by 0.99%. The diff coverage is 45.83%.

@@           Coverage Diff           @@
##           master      #49   +/-   ##
=======================================
- Coverage   74.78%   73.78%   -1%     
=======================================
  Files           4        4           
  Lines         805      824   +19     
=======================================
+ Hits          602      608    +6     
- Misses        203      216   +13

Impacted Files	Coverage Δ
etl_manager/etl.py	56.65% <45.83%> (-2.23%)	:arrow_down:

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