Output compiled validator to source tree as well

Output message_validate.js to both dist/src/data and src/data. This
allows tools to directly consume the TypeScript sources in src/data
without throwing an error due to message_validate being missing.

packages/lib/.gitignore

@@ -0,0 +1 @@
+/src/data/message_validate.js

packages/lib/scripts/compile_validator.js

@@ -22,7 +22,11 @@ const ajv = new Ajv({
 });
 const validate = ajv.compile(Message.jsonSchema);
 let moduleCode = standaloneCode(ajv, validate);
-fs.outputFileSync(
-	path.join(__dirname, "../dist/src/data/message_validate.js"),
-	`// generated by scripts/compile_validator.js\n// @ts-nocheck\n/* eslint-disable */\n${moduleCode}`
-);
+function write(output) {
+	fs.outputFileSync(
+		path.join(__dirname, output),
+		`// generated by scripts/compile_validator.js\n// @ts-nocheck\n/* eslint-disable */\n${moduleCode}`
+	);
+}
+write("../dist/src/data/message_validate.js");
+write("../src/data/message_validate.js");