feat(alias-finder): Use ripgrep if possible

- basic grep is too slow for very long command. ripgrep can easily remediate this issue.

plugins/alias-finder/README.md

@@ -11,6 +11,8 @@ plugins=(... alias-finder)
 
 To enable it for every single command, set zstyle in your `~/.zshrc`.
 
+If the user has installed `rg`([ripgrep](https://github.com/BurntSushi/ripgrep)), it will be used because it's faster. Otherwise, it will use the `grep` command.
+
 ```zsh
 # ~/.zshrc
 

plugins/alias-finder/alias-finder.plugin.zsh

@@ -43,7 +43,11 @@ alias-finder() {
       filter="^'?.{1,$((cmdLen - 1))}'?=" # some aliases is surrounded by single quotes
     fi
 
-    alias | grep -E "$filter" | grep -E "=$finder"
+    if command -v rg >/dev/null 2>&1; then
+      alias | rg "$filter" | rg "=$finder"
+    else
+      alias | grep -E "$filter" | grep -E "=$finder"
+    fi
 
     if [[ $exact == true ]]; then
       break # because exact case is only one