[IMP] account, l10n_*: Introduce unified reporting engine

This commit adapts account's model to the new report engine introduced for v16, and updates the data files accordingly.

account.report model is now declared in community, together with the other models used by the reporting. This is done so that the tax tags can properly be created by the tax report and used on tax templates. All the actual computation logic stays in enterprise.

See enterprise commit for full details.

Task 2524389

Part-of: odoo/odoo#94125