Rewrite integration tests as a Go test

[bradleyjkemp]

This now means integration tests count towards code coverage 🙂

Using the CodeCov "flags" feature to be able to separately track unit and integration test coverage.

[golangcibot]

SA2002: the goroutine calls T.Fatal, which must be called in the same goroutine as the test (from staticcheck)

[golangcibot]

SA2002: the goroutine calls T.Fatal, which must be called in the same goroutine as the test (from staticcheck)

[codecov]

Codecov Report

Merging #38 into master will increase coverage by 41.76%.
The diff coverage is 56.19%.

@@             Coverage Diff             @@
##           master      #38       +/-   ##
===========================================
+ Coverage   16.32%   58.09%   +41.76%     
===========================================
  Files           6       30       +24     
  Lines         294     1069      +775     
===========================================
+ Hits           48      621      +573     
- Misses        240      364      +124     
- Partials        6       84       +78

Flag	Coverage Δ
#integration	57.43% <56.19%> (?)
#unit	15.84% <0%> (?)

Impacted Files	Coverage Δ
grpc-fixture/fixture/load.go	81.81% <ø> (ø)
grpc-dump/dump/recorded_server_stream.go	100% <ø> (ø)
grpc-fixture/fixture/fixture_interceptor.go	74.19% <ø> (ø)
grpc-proxy/config.go	46.42% <100%> (+46.42%)	⬆️
internal/connPool.go	88.88% <100%> (ø)
grpc-dump/dump/dump_interceptor.go	78.26% <100%> (ø)
internal/proxydialer/util.go	28.57% <28.57%> (ø)
grpc-proxy/proxy.go	67.85% <33.33%> (+67.85%)	⬆️
grpc-fixture/fixture/fixture.go	50% <50%> (ø)
internal/proxydialer/proxy.go	53.12% <53.12%> (ø)
... and 32 more

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