Add grpc unary server interceptor

[shouichi]

This is a draft PR to support grpc (see #240). The main goal is to gather feedback and agree on the interface. Thus tests are not written yet. Any feedback/comments are welcomed. Thanks!

[shouichi]

@rhcarvalho Added tests. Please take a look.

[shouichi]

@rhcarvalho @spaceweasel Hi, it's been a while but could you take another look at this PR?

[becoded]

I was looking for this. Glad to see it's only a review away from getting it merged!

[odannyc]

Hi, it's been some time since this has been open. Are there plans to merge this in?

@rhcarvalho @spaceweasel

[Vesquen]

This is exactly what I'm looking for. The pull request has been open for a while. Any chance this still can get a review? @rhcarvalho @spaceweasel

[koteesy]

Any news?

[serbanmarti]

Really looking forward to this getting merged!

[legosx]

Can't wait to see it's merged. This is exactly what I was looking for! Thanks a lot

[prasad-marne]

Any updates. If it needs any help, i can do it.

[pablodz]

Still relevant, please update status

[flyte]

Could this maybe be turned into a separate package if it's not going to be merged?

[HurSungYun]

there's a seperate package here but code is not exactly same.

https://github.com/johnbellone/grpc-middleware-sentry

using this package until this PR merged can be a temporal solution.

[github-actions[bot]]

This pull request has gone three weeks without activity. In another week, I will close it.

But! If you comment or otherwise update it, I will reset the clock, and if you label it Status: Backlog or Status: In Progress, I will leave it alone ... forever!

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"A weed is but an unloved flower." ― Ella Wheeler Wilcox 🥀