*bus,mail

This commit extracts the common basis of the env to use both in
the frontend and the backend. The public env now contains most of
the features that were previously (only) in the webclient env.

Moreover, the PublicRoot no longer uses the ServiceProviderMixin,
such that services are only deployed once, in the (public) env.

Owl components can now be defined in the website, and rely on a
properly built env. Legacy widgets still works as they access
services through the PublicRoot (via trigger_up) which redirects
those requests to the env.

This commit fixes the method GET in httpRequest and
adds it in test_env.

Before this commit, the GET method crashed because
of the forced body param.

closes odoo/odoo#51980

X-original-commit: 7c4fba660a13c38048020faf595bd348d1bca225
Signed-off-by: Aaron Bohy (aab) <aab@odoo.com>

Having _lt in the env doesn't make much sense, as it is useless
at run time, and it would incite people to require 'web.env' to
use it (at load time). The env should never be directly imported,
it is automatically propagated from parents to children.

To sum up, in Owl components:
 - when terms have to be translated at run time (e.g. in a function
   called when the user clicks on a button), the env is available
   and env._t must be used
 - when terms have to be translated at load time (e.g. a JS module
   defining a component with a translatable static property), one
   must require 'web.translation' and use function _lt it exports.

closes odoo/odoo#50656

Signed-off-by: Géry Debongnie (ged) <ged@openerp.com>

Since 671a5471cd891, services are deployed twice in the backend:
once by the webclient (as it is a ServiceProvider), and once by the
env (which now deploys the services to make them directly available
for each Owl component of the component tree). As a consequence,
some services perform twice some operations (e.g. the mail service
fetches twice the /mail/init_messaging route, the crash manager
service displays twice the tracebacks...).

This commit fixes the issue by making the webclient directly use
services from the env, instead of deploying them a second time.

Part of 2183810

closes odoo/odoo#44301

Signed-off-by: Lucas Perais (lpe) <lpe@odoo.com>

This commit adds the ComponentAdapter, an Owl component meant to
be used as universal adapter for Owl components that embed Odoo
legacy widgets.

This component will be a precious tool during the transition phase
of converting our JS codebase from the legacy (widget) framework to
Owl.

With this commit, we properly introduce the Owl library into our beloved
codebase. More information on the Owl library can be found in the project
repository: https://github.com/odoo/owl/

Co-authored-by: Aaron Bohy <aab@odoo.com>
Co-authored-by: Julien Mougenot <jum@odoo.com>
Co-authored-by: Mathieu Duckerts-Antoine <dam@odoo.com>