feat: Create the Medusa API SDK as js-sdk package (#7276)

.eslintrc.js

@@ -100,6 +100,7 @@ module.exports = {
           "./packages/core/orchestration/tsconfig.json",
           "./packages/core/workflows-sdk/tsconfig.spec.json",
           "./packages/core/modules-sdk/tsconfig.spec.json",
+          "./packages/core/js-sdk/tsconfig.spec.json",
           "./packages/core/types/tsconfig.spec.json",
           "./packages/core/utils/tsconfig.spec.json",
           "./packages/core/medusa-test-utils/tsconfig.spec.json",