chore: automate openapi schema list (#6463)

## About the changes
This PR automates the generation of exported open api schemas on
pre-commit, removing some manual steps and also standardizing the
process. The schema list definition now looks way simpler:

https://github.com/Unleash/unleash/blob/b6f3877296389fcecd344d1c9295027ac6c6d52a/src/lib/openapi/index.ts#L37-L49

Also added
https://github.com/Unleash/unleash/blob/2817e66b29ecf5bc908e340931cbdc0281192dea/src/lib/openapi/spec/index.ts#L1-L4
for devs

.husky/pre-commit

@@ -2,3 +2,10 @@
 . "$(dirname -- "$0")/_/husky.sh"
 
 npx lint-staged
+
+node .husky/update-openapi-spec-list.js
+
+# Check if the src/lib/openapi/spec/index.ts file was modified and if so, add it to the commit
+if git ls-files -m | grep -q "src/lib/openapi/spec/index.ts"; then
+  git add src/lib/openapi/spec/index.ts
+fi

.husky/update-openapi-spec-list.js

@@ -0,0 +1,34 @@
+const fs = require('fs');
+const path = require('path');
+
+const directoryPath = path.join(`${__dirname}/..`, 'src/lib/openapi/spec');
+const indexPath = path.join(directoryPath, 'index.ts');
+
+// Read files from the directory
+fs.readdir(directoryPath, (err, files) => {
+    if (err) {
+        console.error('Could not list the directory.', err);
+        process.exit(1);
+    }
+
+    const exports = files
+        .filter((file) => file.includes('schema.ts')) // Filter files by 'schema.ts'
+        .map((file) => `export * from './${file.replace('.ts', '')}';`) // Create export statements
+        .join('\n');
+
+    // Append export statements to index.ts
+    const script = path.basename(__filename);
+    const message = `/**
+ * Auto-generated file by ${script}. Do not edit.
+ * To run it manually execute \`node ${script}\` from ${path.basename(
+     __dirname,
+ )}
+ */\n`;
+    fs.writeFileSync(indexPath, `${message}${exports}\n${message}`, (err) => {
+        if (err) {
+            console.error('Could not append to file.', err);
+            process.exit(1);
+        }
+        console.log('Export statements added to index.ts successfully.');
+    });
+});