Major/change models to get data from system tables

[cmagno-ind]

PR Checklist

PR Structure

• This PR has reasonably narrow scope (if not, break it down into smaller PRs).
• This PR avoids mixing refactoring changes with feature changes (split into two PRs
  otherwise).

Thoroughness

• This PR adds tests for the most critical parts of the new functionality or fixes.
• I've updated the docs and README with the added features, breaking changes, new instructions on how to use the repository.

Release planning

• I've decided if this PR requires a new major/minor/patch version accordingly to
  semver, and I've changed the name of the BRANCH to release/* , feature/* or patch/* .

What

This PR aims to change the sources of Databricks billing package.

Now Databricks has system tables that have informations about costs in the platform, so this PR changes the sources to the new ones, adapting its models to get more information about prices, warehouses and clusters.

Why

Databricks has new system tables with information about billing.

Known limitations

N/A