added performance metrics LabGraph issue 78

[mark-nguyen1]

Description

Please include a summary of the feature or issue being fixed. Please also include relevant motivation and context. List any dependencies that are required for this change.

Fixes #(issue)

Type of change

Please delete options that are not relevant.

• [x] New feature (non-breaking change which adds functionality)
• [x] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [x] This change requires a documentation update

Feature/Issue validation/testing

Please describe the tests [UT/IT] that you ran to verify your changes and relevent result summary. Provide instructions so it can be reproduced. Please also list any relevant details for your test configuration.

• [ ] Test A

• [ ] Test B

• Unit Test / Integration Test (UT/IT) execution results

• Logs

Checklist:

• [ ] Have you added tests that prove your fix is effective or that this feature works?
• [ ] New and existing unit tests pass locally with these changes?
• [x] Has code been commented, particularly in hard-to-understand areas?
• [ ] Have you made corresponding changes to the documentation?

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[mark-nguyen1]

Added real-time performance metrics of Latency, Throughput, and Data rate. Demoed at maintainer meeting 8/11/22 and maintainer said good to pull request

[jfResearchEng]

Please add the relevant tests and clear description on how the tests can be run in relevant places (e.g. documentation and PR description update).

[varshar4]

Make sure to add the contributor license agreement though!