Add grpc interceptors

[ribice]

Resolves #240

Sample error logged to Sentry:

Possible improvements / todos:

• Create docs in sentry and sentry-docs
• The options is a simple struct (as in other integrations). Could implement Functional Options Pattern for these.
• More tests and examples?

[codecov]

Codecov Report

Attention: Patch coverage is 84.29119% with 41 lines in your changes missing coverage. Please review.

Project coverage is 83.67%. Comparing base (109fca1) to head (dda5723).

Files with missing lines	Patch %	Lines
grpc/server.go	80.11%	28 Missing and 7 partials ⚠️
grpc/client.go	92.94%	5 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #938      +/-   ##
==========================================
+ Coverage   83.64%   83.67%   +0.03%     
==========================================
  Files          49       52       +3     
  Lines        5129     5410     +281     
==========================================
+ Hits         4290     4527     +237     
- Misses        682      718      +36     
- Partials      157      165       +8     

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