Implemented a performance data graphing module for batch mode

[rayyang29]

Description of what I changed

I implemented a module for monitoring the resource usage of batch mode with HAPI as the source. This module generates graphs and csv files of resource usage (CPU, memory and I/O) of the HAPI server, postgres database and pipeline over the duration of the batch job. The user is able to specify the number of processes/cores used in the pipeline to assess batch mode's performance on the local machine.

The following files have been added in this PR:
/utils/resource-monitor/graph_pidstat.py - The driver program for generating graphs and tables of resource usage.
/utils/resource-monitor/monitor_pipeline.sh - A bash script that starts monitoring processes for the server, database and pipeline; called by the driver program.
/utils/resource-monitor/auto.sh - A bash script that automates the generation of resource usage graphs and csv files with different number of cores used in the batch job.
/utils/resource-monitor/README.md - README file for the resource-monitor module.
/docker/hapi-compose.yml - A docker .yml file for the latest version HAPI server with postgresql database.

Related to issue #266

E2E test

TESTED:

Checklist: I completed these to help reviewers :)

• My IDE is configured to follow the code style of this project.

  No? Unsure? -> configure your IDE, format the code and add the changes with git add . && git commit --amend

• I am familiar with Google Style Guides for the language I have coded in.

  No? Please take some time and review Java and Python style guides. Note, when in conflict, OpenMRS style guide overrules.

• I have added tests to cover my changes. (If you refactored existing code that was well tested you do not have to add tests)

  No? -> write tests and add them to this commit git add . && git commit --amend

• I ran mvn clean package right before creating this pull request and added all formatting changes to my commit.

• All new and existing tests passed.

  No? -> figure out why and add the fix to your commit. It is your responsibility to make sure your code works.

• My pull request is based on the latest changes of the master branch.

  No? Unsure? -> execute command git pull --rebase upstream master

[bashir2]

Thanks @rayyang29 for this; we should also add the graphs with some notes in a separate doc/wiki page once you have them altogether.

[rayyang29]

Thanks @bashir2 for the code review! I answered the questions, made style changes and ran the black formatter on the python script. Though please have a look at the format produced by the formatter. I will update the PR with the changes.

[bashir2]

Thanks Ray for the changes; I think all of the remaining comments are minor/doc/questions.

[rayyang29]

Thanks @bashir2 for your additional comments. I've made some minor changes and addressed all unresolved conversations.