refactor argument system

- arguments can have multiple names simultaneously
- argument values can be passed using spaces (e.g., --arg value)
- single-character arguments can be passed using a single dash (e.g., --a -> -a)
- multiple single-character arguments can be combined (e.g., -a -b -> -ab)
- simplify custom arguments using generic classes

src/commonMain/kotlin/com/infendro/cli/exception/run/UnknownCommandException.kt

@@ -1,5 +1,10 @@
 package com.infendro.cli.exception.run
 
+import com.infendro.cli.exception.CliException
+
 class UnknownCommandException(
     val command: String,
-) : Exception()
+) : CliException() {
+    override val message: String
+        get() = """unknown command "$command""""
+}