Refactor extension functions to add_extensions scripts

src/scripts/extensions/gearman.sh

@@ -0,0 +1,22 @@
+# Helper function to add gearman extension.
+add_gearman_helper() {
+  add_ppa ondrej/pkg-gearman
+  install_packages libgearman-dev
+  enable_extension gearman extension
+  if ! check_extension gearman; then
+    status="Installed and enabled"
+    if [[ "${version:?}" =~ 5.[3-5] ]]; then
+      pecl_install gearman-1.1.2
+    else
+      install_packages php"${version:?}"-gearman || pecl_install gearman
+    fi
+    enable_extension gearman extension
+  fi
+}
+
+# Function to add gearman extension.
+add_gearman() {
+  status="Enabled"
+  add_gearman_helper >/dev/null 2>&1
+  add_extension_log "gearman" "$status"
+}