Autotranslate: add stats: for monitoring the usage of "import", "export" and "automatic" translate feature

[mahajantejas]

Is your feature request related to a problem? Please describe. Present logs are limited to showing usage of automatic translations. We do not have visibility on the usage of import and export translations feature we have provided. This is needed so as to weigh the usage in before making the enhancements being requested.

Describe the solution you'd like Add logs for monitoring usage of "import", "export" and "automatic"