[CLI] Introduce new compiler arguments for registering compiler plugins

With new syntax each plugin should be registered in separate argument with syntax
`-Xcompiler-plugin=classpath1,classpath2[=argument1=value1,argument2=value2]`

compiler/testData/cli/jvm/plugins/mixingModernAndLegacyArgs.out

@@ -0,0 +1,8 @@
+error: mixing legacy and modern plugin arguments is prohibited. Please use only one syntax
+Legacy arguments:
+  -Xplugin=dist/kotlinc/lib/allopen-compiler-plugin.jar
+  -P plugin:org.jetbrains.kotlin.allopen:annotation=foo.AllOpen
+Modern arguments:
+  -Xcompiler-plugin=dist/kotlinc/lib/noarg-compiler-plugin.jar=annotation=foo.NoArg
+
+COMPILATION_ERROR