Add container databases and mocked data

[lucbpz]

Things this PR adds:

• Goes back to npm (had some problems with yarn).
• Adds usql binaries.
• Adds data-grid-pro and labs (needed for the tree component that I used initially).
• Adds first screen with DB containers.
  • I tested this with postgres.
• Adds second screen with DB layout -> table list and data-grid or empty state.
  • This is all mocked.

TO DO:

• Add Dialog to allow the user to change default parameters.
• Add the possibility of selecting a table from the list.
  • Show empty state only when no table selected.
• Make usql work - Copying the executable file is not working currently.
• Listen to events to keep the DB containers updated.