Pluggable HttpRequestInterceptor for Hive JDBC

Allows client to pass in the name of a customize HttpRequestInterceptor, instantiate the class and adds it to HttpClient.

Example usage: We would like to pass in a HttpRequestInterceptor for OAuth2.0 Authentication purpose. The HttpRequestInterceptor will acquire and/or refresh the access token and add it as authentication header each time HiveConnection sends the HttpRequest.