This commit, adds a new python method (`web_save`) to save a record, and
optionally read-it again in one rpc call. This optimizes the current
behavior that is to save a record in one rpc, and read-it in a second
rpc.
web_save, will receive the list of IDs of the records to save (if this
list is empty it will create the records, if not, it will write on the
existing records), the list of changed fields, and the unity
specification as optional argument to read the created/modified records
(if the specification is not set, the function will return a list of IDs
of the created/modified records).
closesodoo/odoo#133021
Task-id: 3453184
Related: odoo/enterprise#46559
Signed-off-by: Aaron Bohy (aab) <aab@odoo.com>