chore: Sample grpcurl request along with sample JSON file

[shim1998]

What this PR does / why we need it: This PR helps in giving a sample grpcurl request which can be sent to the grpc server that is created on Feast. More insight on how to send request through JSON is also given as, the format of the JSON file was not specified and was inferred from the sample python file provided in the repository. Which issue(s) this PR fixes:

Fixes # https://github.com/feast-dev/feast/issues/2743

[feast-ci-bot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: shim1998 To complete the pull request process, please assign achals after the PR has been reviewed. You can assign the PR to them by writing /assign @achals in a comment when ready.

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[shim1998]

/assign @achals

[achals]

Can you update protos/README.md with some description about these commands?

[achals]

/ok-to-test

[achals]

Also, @shim1998 you'll have to sign your commits! Details here.

[achals]

Hi @shim1998 are you still working on this PR?

[shim1998]

@achals i am not able to sign my commits on this, which is why i was blocked on this! I have to end up doing a git pull everytime.

[stale[bot]]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.