Update libs and add options to constructor for more flexibility

[k-i-k-s]

Summary of Main Changes and Their Purpose

1. TypeScript Module Update (index.d.ts):

   • The module declaration for apollo-datasource-mongodb has been updated to include new options such as lean, disableMemoize, and keyPrefix. This allows for more flexibility in configuring the data source.

2. Package Version Updates (package.json):

   • Various dependencies (e.g., Babel, Jest, MongoDB, Mongoose) have been updated to their latest versions to ensure compatibility and performance improvements.

3. Test Enhancements:

   • Several test files (cache.test.js, datasource.test.js) have been enhanced to include more comprehensive testing scenarios.
   • The tests now cover additional edge cases such as handling lean option, caching with a key prefix, and disabling memoization.

4. Cache Implementation Updates (cache.js):

   • The createCachingMethods function has been updated to handle the new options (lean, disableMemoize, keyPrefix). It now properly configures the DataLoader and cache behavior based on these options.
   • Enhanced logging for better debugging.

5. Data Source Class Updates (datasource.js):

   • The MongoDataSource constructor now accepts an additional options parameter, allowing it to pass options to the createCachingMethods.

6. Helper Function Updates (helpers.js):

   • The DEBUG flag is now conditionally set based on environment variables (NODE_ENV and __DEBUG). This allows for more granular control over debugging behavior.