[19.0] Fixed compatibility issues with odoo19 for fastapi

[abdullahoday710]

The latest odoo19 branch has introduced breaking changes for the module "fastapi"

This pull request makes the module installable on odoo19.

Key fixes :

• Updated manifest.py to make the project installable and also bumped the base version to 19

• Odoo19 has changed the python class names for Partner and Users to ResPartner and ResUsers and fastapi module imported them directly, The import names have been fixed accordingly

• Odoo19 has changed the field name for users in "res.groups" from "users" to "user_ids" therefore res_groups.xml files has been patched with these changes

• Odoo19 removed the field "category_id" from the model "res.groups" for some reason, Therefore I have removed the field in res_groups.xml

• Odoo19 also changed the groups field name for the model "ir.ui.menu" to group_ids, So I have fixed that in fastapi_menu.xml

• Odoo19 search view definition doesn't allow the tag anymore so I have removed it, Keeping only the "App" filter.

After testing the commit, The expected result is that the "fastapi" module can be installed on an odoo19 database.

[abdullahoday710]

Apparently someone else is working on this, So I will close that PR