feat: XHR Transport and Fetch Transport for React Native support (among others)

[fundthmcalculus]

After spending several days working on react native for grpc, I was able to adapt the @improbable-end/grpc-web-react-native-transport to work with nice-grpc-web. This enables support for grpc web in react native where websockets are not supported.

Also, added support for fetch api in cases where arrayBuffer() is not supported. blob() mode is supported, but only in a base64 format. Hence the optional blobMode configuration parameter.

[aikoven]

Thank you for your contribution @fundthmcalculus!

I will happily merge the PR once the tests turn green. Please ping me if you need any assistance.

Mind the flaky tests with traefik though. Ignore errors like in this run: https://github.com/deeplay-io/nice-grpc/actions/runs/4736697563/jobs/8409567422

[fundthmcalculus]

Thanks for the quick feedback! I've actually got another change I'm going to bring into this PR which will enable fetch APIs when you don't have file reader support on react native.

[fundthmcalculus]

@aikoven if you could take a look as to why the tests are failing, I'd really appreciate it.

[aikoven]

The NodeJS tests fail because of this error:

ReferenceError: FileReader is not defined
  at /home/runner/work/nice-grpc/nice-grpc/packages/nice-grpc-web/src/client/transports/fetch.ts:16:24

The browser tests are hanging for some reason. You can try running them locally using

yarn test:local-browser-headless

from the packages/nice-grpc-web directory. You need to have Docker running.

[hollanderbart]

@fundthmcalculus What's the status of this PR? Can you please fix the failing tests? It would be nice to use it in our app, because grpc support in react native isn't really supported.