feat(nvm): introduce customizable list of command that triggers lazy loading (#9946)

* Add customizable list of command that triggers lazy loading

* Add $NVM_LAZY_CMD

* Add instruction to `NVM_LAZY_CMD` in README.md

plugins/nvm/nvm.plugin.zsh

@@ -28,8 +28,8 @@ fi
 
 # Call nvm when first using node, npm or yarn
 if (( $+NVM_LAZY )); then
-  function node npm yarn {
-    unfunction node npm yarn
+  function node npm yarn $NVM_LAZY_CMD {
+    unfunction node npm yarn $NVM_LAZY_CMD
     nvm use default
     command "$0" "$@"
   }