[exporter/splunkhecexporter] Adding splunkhecexporter integration tes…

…ts (#23637)

**Description:**
Add a test suite to the opentelemetry-contrib repository that checks the
behavior of the HEC exporter against a Splunk Enterprise instance.

exporter/splunkhecexporter/go.mod

@@ -10,6 +10,7 @@ require (
 	github.com/open-telemetry/opentelemetry-collector-contrib/pkg/batchperresourceattr v0.88.0
 	github.com/open-telemetry/opentelemetry-collector-contrib/pkg/pdatatest v0.88.0
 	github.com/stretchr/testify v1.8.4
+	github.com/testcontainers/testcontainers-go v0.25.0
 	go.opencensus.io v0.24.0
 	go.opentelemetry.io/collector/component v0.88.0
 	go.opentelemetry.io/collector/config/confighttp v0.88.0
@@ -22,30 +23,60 @@ require (
 	go.opentelemetry.io/collector/semconv v0.88.0
 	go.uber.org/multierr v1.11.0
 	go.uber.org/zap v1.26.0
+	gopkg.in/yaml.v3 v3.0.1
 )
 
 require (
+	dario.cat/mergo v1.0.0 // indirect
+	github.com/Azure/go-ansiterm v0.0.0-20210617225240-d185dfc1b5a1 // indirect
+	github.com/Microsoft/go-winio v0.6.1 // indirect
+	github.com/Microsoft/hcsshim v0.11.0 // indirect
 	github.com/cespare/xxhash/v2 v2.2.0 // indirect
+	github.com/containerd/containerd v1.7.6 // indirect
+	github.com/cpuguy83/dockercfg v0.3.1 // indirect
 	github.com/davecgh/go-spew v1.1.1 // indirect
+	github.com/docker/distribution v2.8.2+incompatible // indirect
+	github.com/docker/docker v24.0.6+incompatible // indirect
+	github.com/docker/go-connections v0.4.0 // indirect
+	github.com/docker/go-units v0.5.0 // indirect
 	github.com/felixge/httpsnoop v1.0.3 // indirect
 	github.com/fsnotify/fsnotify v1.7.0 // indirect
 	github.com/go-logr/logr v1.2.4 // indirect
 	github.com/go-logr/stdr v1.2.2 // indirect
+	github.com/go-ole/go-ole v1.2.6 // indirect
 	github.com/gogo/protobuf v1.3.2 // indirect
 	github.com/golang/protobuf v1.5.3 // indirect
 	github.com/golang/snappy v0.0.4 // indirect
+	github.com/google/uuid v1.3.1 // indirect
 	github.com/klauspost/compress v1.17.2 // indirect
 	github.com/knadh/koanf/maps v0.1.1 // indirect
 	github.com/knadh/koanf/providers/confmap v0.1.0 // indirect
 	github.com/knadh/koanf/v2 v2.0.1 // indirect
+	github.com/lufia/plan9stats v0.0.0-20211012122336-39d0f177ccd0 // indirect
+	github.com/magiconair/properties v1.8.7 // indirect
 	github.com/mitchellh/copystructure v1.2.0 // indirect
 	github.com/mitchellh/mapstructure v1.5.1-0.20220423185008-bf980b35cac4 // indirect
 	github.com/mitchellh/reflectwalk v1.0.2 // indirect
+	github.com/moby/patternmatcher v0.5.0 // indirect
+	github.com/moby/sys/sequential v0.5.0 // indirect
+	github.com/moby/term v0.5.0 // indirect
 	github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirect
 	github.com/modern-go/reflect2 v1.0.2 // indirect
+	github.com/morikuni/aec v1.0.0 // indirect
 	github.com/open-telemetry/opentelemetry-collector-contrib/pkg/pdatautil v0.88.0 // indirect
+	github.com/opencontainers/go-digest v1.0.0 // indirect
+	github.com/opencontainers/image-spec v1.1.0-rc4 // indirect
+	github.com/opencontainers/runc v1.1.5 // indirect
+	github.com/pkg/errors v0.9.1 // indirect
 	github.com/pmezard/go-difflib v1.0.0 // indirect
+	github.com/power-devops/perfstat v0.0.0-20210106213030-5aafc221ea8c // indirect
 	github.com/rs/cors v1.10.1 // indirect
+	github.com/shirou/gopsutil/v3 v3.23.9 // indirect
+	github.com/shoenig/go-m1cpu v0.1.6 // indirect
+	github.com/sirupsen/logrus v1.9.0 // indirect
+	github.com/tklauser/go-sysconf v0.3.12 // indirect
+	github.com/tklauser/numcpus v0.6.1 // indirect
+	github.com/yusufpapurcu/wmi v1.2.3 // indirect
 	go.opentelemetry.io/collector v0.88.0 // indirect
 	go.opentelemetry.io/collector/config/configauth v0.88.0 // indirect
 	go.opentelemetry.io/collector/config/configcompression v0.88.0 // indirect
@@ -58,13 +89,15 @@ require (
 	go.opentelemetry.io/otel v1.19.0 // indirect
 	go.opentelemetry.io/otel/metric v1.19.0 // indirect
 	go.opentelemetry.io/otel/trace v1.19.0 // indirect
+	golang.org/x/exp v0.0.0-20230711023510-fffb14384f22 // indirect
+	golang.org/x/mod v0.13.0 // indirect
 	golang.org/x/net v0.17.0 // indirect
 	golang.org/x/sys v0.13.0 // indirect
 	golang.org/x/text v0.13.0 // indirect
+	golang.org/x/tools v0.14.0 // indirect
 	google.golang.org/genproto/googleapis/rpc v0.0.0-20230822172742-b8732ec3820d // indirect
 	google.golang.org/grpc v1.59.0 // indirect
 	google.golang.org/protobuf v1.31.0 // indirect
-	gopkg.in/yaml.v3 v3.0.1 // indirect
 )
 
 replace github.com/open-telemetry/opentelemetry-collector-contrib/internal/coreinternal => ../../internal/coreinternal