Remove grpc dependency

[nick-w-nick]

Currently, the grpc dependency is causing the issue shown in issue #231 due to an incompatibility with the most recent version of grpc and any platform other than Linux based on our testing. We've also shown reports that the prebuilt binaries downloaded by gprc are causing massive bloat (nearly a 5x increase in size) to our bundles that are generated with the dependency included.

Upon investigation, we noticed that grpc isn't actually used by anything in the library anymore, and was seemingly added back by mistake during the most recent release, as @grpc/grpc-js is used in place of it.

Sources:
Original PR to remove grpc
PR I made last year, where grpc was not in the list of dependencies at the time, reinforcing the fact that it was added back by mistake
The README of this very repo, which has instructions to install @grpc/grpc-js and not grpc, and here is the PR where that change was made

This PR is to remove the grpc dependency from the package to accomplish the following:

• remedy the installation issue
• reduce install sizes
• get rid of an unused dependency

[shivaji-kharse]

looking good to me

[nick-w-nick]

@shivaji-kharse Thank you for merging the change! I would very much appreciate it if this could make it into a release sometime soon to resolve the issues we are facing with the current version of the library.

Thank you!