TUN-5551: Show whether the binary was built for FIPS compliance

This is shown in 3 ways:
 - the version output with `cloudflared version` and alike commands
 - the build_info prometheus metric
 - a logging message

cmd/cloudflared/cliutil/build_info.go

@@ -0,0 +1,49 @@
+package cliutil
+
+import (
+	"fmt"
+	"runtime"
+
+	"github.com/rs/zerolog"
+)
+
+type BuildInfo struct {
+	GoOS               string `json:"go_os"`
+	GoVersion          string `json:"go_version"`
+	GoArch             string `json:"go_arch"`
+	BuildType          string `json:"build_type"`
+	CloudflaredVersion string `json:"cloudflared_version"`
+}
+
+func GetBuildInfo(buildType, version string) *BuildInfo {
+	return &BuildInfo{
+		GoOS:               runtime.GOOS,
+		GoVersion:          runtime.Version(),
+		GoArch:             runtime.GOARCH,
+		BuildType:          buildType,
+		CloudflaredVersion: version,
+	}
+}
+
+func (bi *BuildInfo) Log(log *zerolog.Logger) {
+	log.Info().Msgf("Version %s", bi.CloudflaredVersion)
+	if bi.BuildType != "" {
+		log.Info().Msgf("Built%s", bi.GetBuildTypeMsg())
+	}
+	log.Info().Msgf("GOOS: %s, GOVersion: %s, GoArch: %s", bi.GoOS, bi.GoVersion, bi.GoArch)
+}
+
+func (bi *BuildInfo) OSArch() string {
+	return fmt.Sprintf("%s_%s", bi.GoOS, bi.GoArch)
+}
+
+func (bi *BuildInfo) Version() string {
+	return bi.CloudflaredVersion
+}
+
+func (bi *BuildInfo) GetBuildTypeMsg() string {
+	if bi.BuildType == "" {
+		return ""
+	}
+	return fmt.Sprintf(" with %s", bi.BuildType)
+}