WIP feat(boards2): protected functions for sub-realms

[jeronimoalbi]

This PR aims to introduce public Boards2 realm functions that can only be called from boards sub realms.

This would be necessary to implement, or move, specific features to sub-realms under gno.land/r/gnoland/boards2 namespace.

These "protected" public functions would allow to implement data migration between Boards2 versions for example, or to add optional features that would require access to specific board data.

Moving or implementing new features as sub-realms would help keeping Boards2 realm leaner and would allow for a more "micro services" oriented approach for new features.

[Gno2D2]

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[jeronimoalbi]

These protected functions would allow to finish implementing board feeds support.

They also would be helpful to have, for example, a specific sub-realm with public functions that would return readonly (wrapped) boards objects to allow better integration from third party realms, or external non web3 apps though JSON.

cc @jefft0

[jeronimoalbi]

Something to have in mind is that each board is intended to work as an independent community managed by a DAO, which is important when board instances are potentially accesible by future sub-realms which could override it.

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