Add -v/--version flag to print version string (#3883)

* Add `-v/--version` flag to print version string

- Created a new flag `-v/--version` in the command-line interface to display the version number and exit.
- Moved all version-related functions inside the config package to the new file `manager/config/version.go` to avoid circular dependencies.
- Added a new `GetVersionString()` function to generate a formatted version string.
- Updated references to the moved version functions.
- Updated references in the `Makefile`.

* Move version embeds to build package

* Remove githash var

---------

Co-authored-by: WithoutPants <53250216+WithoutPants@users.noreply.github.com>

internal/build/version.go

@@ -0,0 +1,57 @@
+package build
+
+import (
+	"regexp"
+)
+
+var version string
+var buildstamp string
+var githash string
+var officialBuild string
+
+func Version() (string, string, string) {
+	return version, githash, buildstamp
+}
+
+func VersionString() string {
+	var versionString string
+	switch {
+	case version != "":
+		if githash != "" && !IsDevelop() {
+			versionString = version + " (" + githash + ")"
+		} else {
+			versionString = version
+		}
+	case githash != "":
+		versionString = githash
+	default:
+		versionString = "unknown"
+	}
+	if IsOfficial() {
+		versionString += " - Official Build"
+	} else {
+		versionString += " - Unofficial Build"
+	}
+	if buildstamp != "" {
+		versionString += " - " + buildstamp
+	}
+	return versionString
+}
+
+func IsOfficial() bool {
+	return officialBuild == "true"
+}
+
+func IsDevelop() bool {
+	if githash == "" {
+		return false
+	}
+
+	// if the version is suffixed with -x-xxxx, then we are running a development build
+	develop := false
+	re := regexp.MustCompile(`-\d+-g\w+$`)
+	if re.MatchString(version) {
+		develop = true
+	}
+	return develop
+}