Added inline code Envis aggregator

[imanishbarnwal]

Description

Added inline documentation for envis_aggregator.py as instructed in the issue.

Relevant Issue

Issue #223

Affected Dependencies

List any dependencies that are required for this change.

How has this been tested?

• Describe the tests that you ran to verify your changes.
• Provide instructions so we can reproduce.
• List any relevant details for your test configuration.

Checklist

• [x] I have followed the Contribution Guidelines and Code of Conduct
• [x] I have commented my code following the NimbleEdge Styleguide
• [x] I have labeled this PR with the relevant Type labels
• [x] My changes are covered by tests

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[imanishbarnwal]

Hey @ramesht007 did everything but this Pytests unittests error not able to fix.

[ramesht007]

hey @imanishbarnwal can you fix the conflict.