feat(boards2): add gno.land/p/gnoland/boards package

[jeronimoalbi]

The gno.land/p/gnoland/boards package is intended to be a part of Boards2 realm.
It would allow making the realm smaller by defining common types within the package.
A follow up PR would refactor Boards2 realm to use this package.

Types are kept minimal so specific logic related to saving or deleting is implemented by the realm.
Package initially had support for deleting and saving but it was removed in favor of a more light weight and less opinionated boards package.

The original idea of having a generic Post type that can represent a thread, repost or reply is kept within the package.

Repost, flagging and replies support are optional features for Post which could be initialized when needed by the realm that imports boards package. A storage interface and a default implementations are available for each one of these.

[Gno2D2]

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[jeronimoalbi]

Something to consider here could be to maybe define NewReply(), NewThread() and NewRepost() in the Boards2 realm, because they have logic which could be considered realm related if you think of boards package as a generic minimal package.

It might be helpful to hear second opinions.

[jefft0]

This PR has tests which pass. This is based on existing realm. No conflicts with master. CI checks pass. Ready for core devs to review.