feat(js-api): Provides FDS atom utilities and state interface through js-api

[antonio-ortega]

This pull request is linked to LPD-86378 - Technical Task | Create a Custom Element Client Extension for the Data Set Search Bar. Including these changes and releasing a new js-api version is required in order to be able to merge the pull request for that LPD, but both must be reviewed together.

What’s New

• Expose a new opinionated API offering some helpers to work with FDS Atom state. Callers could use subscribeSearch and subscribeFilters to interact with the atom. They just need to pass which fdsName they want to subscribe to, and once the subscription promise is resolved, they'll get an API (get, set, dispose) as a result to work with it.
• Once the FDS Atom State grows (page, user views, order, ....) we can increase this API accordingly.
• Since we want callers to only subscribe to that slice of the atom they will use, we hide getFDSAtom, because it is needed internally, but it should not be needed externally. We don't want them to manipulate the whole atom, just their slice.

Dev Highlights

• All the way until now this js-api have been used to provide some useful types for developers. Now, we had a bit of a different case because we want to offer some functionality rather than just some types, we are providing some API so external developers could get a slice of an atom just by the FDS Name and manipulate it.
• In order to slice the atom, we are using selectors, so every API is offering to subscribe only to the specific selector.
• getFDSAtom internal utility is in charge of polling for the atom and hiding the internal suffix _fdsState which does not need to be known by external callers.

[antonio-ortega]

It follows here #1267