Provide the UI page of gRPC testing

[Rick]

Thanks to @Ink-33, this project has the gRPC feature. But the web UI is still very important. Please see also the following ideas if anyone is interested in it:

• Having the similar UI style of the HTTP feature

We will have a release after this issue.

References

• #81

[Ink33]

Got it.

[Rick]

close by #81