feat(Insights): add anonymous usage data collection (#3543)

* feat(insights): initial code (WIP)

* feat(insights): add more info

* feat(insights): add fs info

* feat(insights): export insights.Data

Signed-off-by: Deluan <deluan@navidrome.org>

* feat(insights): more config info

Signed-off-by: Deluan <deluan@navidrome.org>

* refactor(insights): move data struct to its own package

Signed-off-by: Deluan <deluan@navidrome.org>

* refactor(insights): omit some attrs if empty

Signed-off-by: Deluan <deluan@navidrome.org>

* feat(insights): send insights to server, add option to disable

Signed-off-by: Deluan <deluan@navidrome.org>

* fix(insights): remove info about anonymous login

Signed-off-by: Deluan <deluan@navidrome.org>

* chore(insights): fix lint

Signed-off-by: Deluan <deluan@navidrome.org>

* fix(insights): disable collector if EnableExternalServices is false

Signed-off-by: Deluan <deluan@navidrome.org>

* fix(insights): fix type casting for 32bit platforms

Signed-off-by: Deluan <deluan@navidrome.org>

* fix(insights): remove EnableExternalServices from the collection (as it will always be false)

Signed-off-by: Deluan <deluan@navidrome.org>

* chore(insights): fix lint

Signed-off-by: Deluan <deluan@navidrome.org>

* refactor(insights): rename function for consistency

Signed-off-by: Deluan <deluan@navidrome.org>

* feat(insights): log the data sent to the collector server

Signed-off-by: Deluan <deluan@navidrome.org>

* feat(insights): add last collection timestamp to the "about" dialog.

Also add opt-out info to the SignUp form

Signed-off-by: Deluan <deluan@navidrome.org>

* feat(insights): only sends the initial data collection after an admin user is created

Signed-off-by: Deluan <deluan@navidrome.org>

* feat(insights): remove dangling comment

Signed-off-by: Deluan <deluan@navidrome.org>

* feat(insights): Translate insights messages

Signed-off-by: Deluan <deluan@navidrome.org>

* fix(insights): reporting empty library

Signed-off-by: Deluan <deluan@navidrome.org>

* refactor: move URL to consts.js

Signed-off-by: Deluan <deluan@navidrome.org>

---------

Signed-off-by: Deluan <deluan@navidrome.org>

core/metrics/insights_darwin.go

@@ -0,0 +1,37 @@
+package metrics
+
+import (
+	"os/exec"
+	"strings"
+	"syscall"
+)
+
+func getOSVersion() (string, string) {
+	cmd := exec.Command("sw_vers", "-productVersion")
+
+	output, err := cmd.Output()
+	if err != nil {
+		return "", ""
+	}
+
+	return strings.TrimSpace(string(output)), ""
+}
+
+func getFilesystemType(path string) (string, error) {
+	var stat syscall.Statfs_t
+	err := syscall.Statfs(path, &stat)
+	if err != nil {
+		return "", err
+	}
+
+	// Convert the filesystem type name from [16]int8 to string
+	fsType := make([]byte, 0, 16)
+	for _, c := range stat.Fstypename {
+		if c == 0 {
+			break
+		}
+		fsType = append(fsType, byte(c))
+	}
+
+	return string(fsType), nil
+}