fix: added grace time to client timeout

[tegefaulkes]

Description

This PR fixes the following issues and addresses some general code clean up.

Issues Fixed

• Fixes Allow server RPC handler to respond after timeout from the client (so that client can receive a richer error message) #57
• Fixes Replace testProp usage with test.prop #58

Tasks

• 1. Address Allow server RPC handler to respond after timeout from the client (so that client can receive a richer error message) #57
• 2. Address Replace testProp usage with test.prop #58
• 3. General clean up of code and tests
• 4. Remove registerOnTimeoutCallback and onTimeoutCallback usage.

Final checklist

• Domain specific tests
• Full tests
• Updated inline-comment documentation
• Lint fixed
• Squash and rebased
• Sanity check the final build

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Legend

[tegefaulkes]

This should've never been merged into staging

    // Wait for server and client to timeout by checking the flag
    await new Promise<void>((resolve) => {
      const checkFlag = () => {
        if (serverTimedOut && clientTimedOut) resolve();
        else setTimeout(() => checkFlag(), 10);
      };
      checkFlag();
    });

I've removed it along with some other related code.

[tegefaulkes]

Ready for merge if anyone wants to have a look over it.

[tegefaulkes]

Most of the general clean up was just syntax and coding style fixes to keep things consistent. I added in some missing type annotation since it's better to be explicit about these things.