feat: add automatic system context to all events (#167)

* feat: add automatic OS detection to all events

* fixes

* Add android and ios mappings for OS names

* add go_version, os_version and os_distro

* fix: target master branch in CodeQL workflow

---------

Co-authored-by: Manoel Aranda Neto <[email protected]>

os_info_windows.go

@@ -0,0 +1,17 @@
+//go:build windows
+
+package posthog
+
+import (
+	"fmt"
+
+	"golang.org/x/sys/windows"
+)
+
+func getOSInfo() osInfo {
+	ver := windows.RtlGetVersion()
+	return osInfo{
+		Name:    "Windows",
+		Version: fmt.Sprintf("%d.%d.%d", ver.MajorVersion, ver.MinorVersion, ver.BuildNumber),
+	}
+}