[IMP] account: add wizard to perform transfers between accounts

This wizard also reconciles automatically entries done on reconcilable accounts. It can hence for example be used to "move" the balance of a receivable account into a payable account (or the opposite), using the generated transfer entry to do as if the receivable and payable accounts were directly reconciled together.

[IMP] account: display 'P' as matching number when account.move.line objects are partially reconciled

For this, we introduce a new matching_number field, used in account.move.line's tree views instead of full_reconcile_id, which used to be shown directly.

Was task: 2037318

closes odoo/odoo#39415

Related: odoo/enterprise#6544
Signed-off-by: Laurent Smet <smetl@users.noreply.github.com>