This is a step closer to a goal of avoiding dependence on asynchronous
modules. Starting from this commit, new tour definition should be
registered to `registry.category("web_tour.tours")` registry.
So, instead of the following:
```js
import tour from "web_tour.tour";
tour.register(name, options, steps);
```
We now do:
```js
import { registry } from "@web/core/registry";
registry.category("web_tour.tours").add(name, optionsWithSteps);
```
Notice the `options` and `steps` params are merged when registering
the tour definition. It should look something like so:
```js
registry.category("web_tour.tours").add("account_tour", {
test: true,
steps: [ ... ],
});
```
And if the `TourManager` instance is needed, one can get it from the
registry like so `registry.get("tourManager")`. Note however that
this instance is only available when the `TourManager` has been
instantiated -- so it's not available at top level of the module.
closesodoo/odoo#111103
Related: odoo/enterprise#36335
Signed-off-by: Géry Debongnie <ged@odoo.com>