feat: ownable2step realm

[0xtekgrinder]

Addresses: #3520

Add a ownable variant realm to have a transfer of ownership with two functions where the new owner needs to accept ownership to be sure no mistake can be made.

[Gno2D2]

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[leohhhn]

This should be a p/, no?

[leohhhn]

lgtm, just a minor comment

EDIT: CI is red, check the tests :)