[ADD] added new tax design.
[FIX] set company_id when creating tax from template, set amount in tax line as per tax rate in invoice configuration view.
[WIP] account: refactoring of taxes new design
[REF] account: refactoring of taxes (new design). Made clean schema. Refactored and fixed the code in several places. WIP
[FIX] account : Fixed the mapping of account tax template and configurable chart of account.
[IMP] Improved the chart of account as per new tax design.