fields.Serialized (widget and improvement contribution)

[sebastienbeau]

We do not have any widget for serialized field (json fields).
Native field is implemented by odoo here : https://github.com/odoo/odoo/tree/master/addons/base_sparse_field
We lack of support of list so this module do it : https://github.com/OCA/server-tools/tree/14.0/base_sparse_field_list_support

Maybe we should in master propose in odoo a PR that:

• support list in Serialized field
• add a widget (in owl) for Serialized field