feat: js/py generate declarations from comments (#30)

tools/demo_tool.sh

@@ -0,0 +1,15 @@
+# @describe Demonstrate how to create a tool using Bash and how to use comment tags.
+# @option --string!                  Define a required string property
+# @option --string-enum![foo|bar]    Define a required string property with enum
+# @option --string-optional          Define a optional string property
+# @flag --boolean                    Define a boolean property
+# @option --integer! <INT>           Define a required integer property
+# @option --number! <NUM>            Define a required number property
+# @option --array+ <VALUE>           Define a required string array property
+# @option --array-optional*          Define a optional string array property
+
+main() {
+    ( set -o posix ; set ) | grep ^argc_ # inspect all argc variables
+}
+
+eval "$(argc --argc-eval "$0" "$@")"