Move utils to a local package

internal/utils/go.mod

@@ -0,0 +1,41 @@
+module github.com/TheThingsNetwork/lorawan-frequency-plans/internal/utils
+
+go 1.19
+
+// Use our fork of grpc-gateway.
+replace github.com/grpc-ecosystem/grpc-gateway => github.com/TheThingsIndustries/grpc-gateway v1.15.2-gogo
+
+// But the original grpc-gateway v2.
+replace github.com/grpc-ecosystem/grpc-gateway/v2 => github.com/grpc-ecosystem/grpc-gateway/v2 v2.10.3
+
+require (
+	go.thethings.network/lorawan-stack/v3 v3.23.2
+	gopkg.in/yaml.v2 v2.4.0
+)
+
+require (
+	github.com/TheThingsIndustries/protoc-gen-go-flags v1.0.6 // indirect
+	github.com/TheThingsIndustries/protoc-gen-go-json v1.4.0 // indirect
+	github.com/envoyproxy/protoc-gen-validate v0.6.3 // indirect
+	github.com/gogo/protobuf v1.3.2 // indirect
+	github.com/golang/protobuf v1.5.2 // indirect
+	github.com/gotnospirit/makeplural v0.0.0-20180622080156-a5f48d94d976 // indirect
+	github.com/gotnospirit/messageformat v0.0.0-20190719172517-c1d0bdacdea2 // indirect
+	github.com/grpc-ecosystem/grpc-gateway v1.16.0 // indirect
+	github.com/grpc-ecosystem/grpc-gateway/v2 v2.0.0-00010101000000-000000000000 // indirect
+	github.com/json-iterator/go v1.1.12 // indirect
+	github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirect
+	github.com/modern-go/reflect2 v1.0.2 // indirect
+	github.com/pkg/errors v0.9.1 // indirect
+	github.com/satori/go.uuid v1.2.0 // indirect
+	github.com/spf13/pflag v1.0.5 // indirect
+	github.com/vmihailenco/msgpack/v5 v5.3.5 // indirect
+	github.com/vmihailenco/tagparser/v2 v2.0.0 // indirect
+	golang.org/x/exp v0.0.0-20220706164943-b4a6d9510983 // indirect
+	golang.org/x/net v0.5.0 // indirect
+	golang.org/x/sys v0.4.0 // indirect
+	golang.org/x/text v0.6.0 // indirect
+	google.golang.org/genproto v0.0.0-20220519153652-3a47de7e79bd // indirect
+	google.golang.org/grpc v1.46.2 // indirect
+	google.golang.org/protobuf v1.28.1 // indirect
+)