Adds a total row count in the footer

# Checklist - [ ] Added passing unit tests - [x] `cargo test` passes locally. It takes much time. - [x] Run `cargo fmt` # Description This PR adds a _total rows_ field in the properties. This is especially useful for large databases, it prevents the need to write an entire request just to know the total count. This fixes #106. **NOTE:** I didn't implemented tests mainly because it didn't find anything useful to test. Would be glad to add some though if you indicate what to test. ## Example :  # Changelog - Adds a total rows count in the footer