Bugfix/#67: App crash on file:// prefix in dynamic loading

[ShristiC]

Problem Summary

Issue: #67
If a path passed in has file://, the app crashes in iOS. Alphacephai vosk returns an error that path found is not correct. When a model is not successfully loaded, there is not enough logging to let a user know that a fallback bundle path will be used.

Summary of Changes

1. Replace file:// in incoming path with '' . A user should be able to pass in a path without doing any pre-processing
2. Add more logging for when dynamic load fails and the main bundle path is used. For users who are only doing static loading - something like this is expected. The error is thrown by the original vosk implementation rather than this npm package. Expect to see the second log to start debugging at the main bundle path.

ERROR (VoskAPI:Model():model.cc:122) Folder <name> does not contain model files...
Model directory does not exist at path <name>. Attempt to load model from main app bundle.