Add git-lfs plugin (#9077)

plugins/git-lfs/git-lfs.plugin.zsh

@@ -0,0 +1,17 @@
+#
+# Aliases
+#
+
+alias glfsi='git lfs install'
+alias glfst='git lfs track'
+alias glfsls='git lfs ls-files'
+alias glfsmi='git lfs migrate import --include='
+
+#
+# Functions
+#
+
+function gplfs() {
+  local b="$(git_current_branch)"
+  git lfs push origin "$b" --all
+}