Odoo may allow prediction to occur when importing an EDI.
i.e. predicting the product, account and taxes of each line.
By default, those predictions will overwrite the actual value.

Though it may be helpful in some cases, there should be a way
to opt-out of the this automatic overwrite and to have a more
flexible way to do those predictions.

Here is how this is now possible:
1. With `disable_onchange_name_predictive` one can
indicate their desire to opt-out of the prediction overwrite
(i.e. the default behavior).
2. They can then use the `_predict_product`, `_predict_account`,
`_predict_taxes` methods to create their own way of prediction.
Placeholders for those were created to allow their use even if the
prediction module isn't present.

NB: As the module in charge of predictions (`account_accountant`)
is not always installed the `edi_prediction_enabled` context key is
used to indicate whether the prediction methods can be used or not.
In the case of this fix, the key is setup in the `l10n_it_reports`
module, as this module is always installed if `account_accountant`
and `l10n_it` are installed.

This way of predicting is useful for cases demanding a less generic
approach to prediction. e.g. For the Italian EDI module the account
of a line can be predicted without any limitation as it is not a value
imported by the EDI. Whereas, its product and taxes should be predicted
only if none were imported.

opw-3201391
opw-3172035

Community PR: https://github.com/odoo/odoo/pull/144437

Forward-Port-Of: odoo/enterprise#51835
Forward-Port-Of: odoo/enterprise#38079