[IMP] sale_timesheet: add timesheet overview

This commits add the timesheet overview on the project
kanban. Instead of redirecting to timesheet list, the user
will see a more detailled view.
The timesheet dashboard shows the amount per billable types,
the numbers of hours provided per employee and per billable
types, ...

This view is integrated with the search view : changing the
filter will shows you the informations for your selection.

The purpose is to give the user a global view of the project
(or other timesheet) financial situation in the same place.

This overview is made to be extended in enterprise to add
a section to compare past (timesheets) and futures (forecasts)
activities.

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