Reverting numpy 1.21.2 to 1.19.2 and adding regression

[NikhilRaverkar]

Issue #, if available:

• fixing Update of numpy to version 1.21.0 causing conflict with pyarrow version #106
• Added regression to catch the re occurrence and to verify change is fixed with this commit
  Description of changes:
• Numpy 1.2x.x broke the integration with Pyarrow 1.0. hence Rolling back numpy version to 1.19.2
• Added regression test

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[mabunday]

Hi Nikhil, for each of these PRs let's make sure

1. Our forks are up to date with the tips of the remote branches. If they aren't, we can always rebase and push instead of opening a new issue, too
2. That tox is executed locally before opening the PR quickly catch small errors before we run the CodeBuild, which is slow to execute. This allows us to iterate faster
3. Our commits and PRs titles/bodies are descriptive https://cbea.ms/git-commit/. Here I would suggest something like "Revert numpy from 1.21.0 to PyArrow compatible 1.19.2; Add unit test for parquet conversion (#106)" as fixing issue #106 doesn't tell us what the nature of the change or issue actually is

[NikhilRaverkar]

The Build has succeeded for this change (build# 86) Hence sending out for review