Handle wrapper proto types as primitives

[nirshirion]

#367

[tmc]

Thanks for your contribution. Have you signed the CLA?

Can you include a test demonstrating this behavior change?

[achew22]

@nirshirion I would like to merge this if it is possible. Would you be willing to sign the CLA?

[achew22]

@nirshirion, could you sign the CLA and add some tests so that we can merge this?

[achew22]

The CLA bot web UI is reporting that you have signed the CLA. Looks like we just need a test and we can submit this. I would love to have it in the project.

[mattolson]

👍 We are running into this as well, and feel that this should be handled transparently by grpc-gateway. Are there any blockers to merging this?

[achew22]

@mattolson, I don't think there is anything blocking us merging this except test coverage

[achew22]

@nirshirion, any chance we could have you come back and add tests to this PR? I would love to merge it!

@mattolson, if you want to take a whack at extending this PR by pulling it into your workspace and writing the tests for it, I would also be happy to merge that.

[johanbrandhorst]

Support for this was merged with #695 and #496 🎉