[New] nvm ls: add --no-alias to suppress alias output

Per https://github.com/creationix/nvm/issues/1792#issuecomment-466696504

nvm.sh

@@ -3138,10 +3138,12 @@ nvm() {
     "ls" | "list")
       local PATTERN
       local NVM_NO_COLORS
+      local NVM_NO_ALIAS
       while [ $# -gt 0 ]; do
         case "${1}" in
           --) ;;
           --no-colors) NVM_NO_COLORS="${1}" ;;
+          --no-alias) NVM_NO_ALIAS="${1}" ;;
           --*)
             nvm_err "Unsupported option \"${1}\"."
             return 55
@@ -3152,12 +3154,16 @@ nvm() {
         esac
         shift
       done
+      if [ -n "${PATTERN-}" ] && [ -n "${NVM_NO_ALIAS}" ]; then
+        nvm_err '`--no-alias` is not supported when a pattern is provided.'
+        return 55
+      fi
       local NVM_LS_OUTPUT
       local NVM_LS_EXIT_CODE
       NVM_LS_OUTPUT=$(nvm_ls "${PATTERN-}")
       NVM_LS_EXIT_CODE=$?
       NVM_NO_COLORS="${NVM_NO_COLORS-}" nvm_print_versions "${NVM_LS_OUTPUT}"
-      if [ -z "${PATTERN-}" ]; then
+      if [ -z "${NVM_NO_ALIAS-}" ] && [ -z "${PATTERN-}" ]; then
         if [ -n "${NVM_NO_COLORS-}" ]; then
           nvm alias --no-colors
         else