Fix: PineconeGrpcFuture blocks during construction

[yorickvP]

Problem

When using grpc with async_req=True, the construction of a PineconeGrpcFuture would call _sync_state, which would do a blocking call to grpc_future.exception(...). This means that the async reqs were all blocking in practice.

Describe the purpose of this change. What problem is being solved and why?

Solution

We can fix it by checking if the future is still running and not doing any blocking calls when it is.

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update
• Infrastructure change (CI configs, etc)
• Non-code change (docs, etc)
• None of the above: (explain here)

Test Plan

How I tested it:

• Before: Run a long query in a loop and hit ctrl-c. Observe the traceback containing PineconeGrpcFuture()
• After: Run a long query in a loop and hit ctrl-c. Observe the traceback containing your .result() call instead.