Support alternateName and legalName fields for organization type schema

Following the parent issue, I have merged the last patch of alternateName and also added changes for legalName.

We tried this patch but alternateName wasn't available.
Then it seems this feature is already covered by this patch : ✨ Support alternateName for Organization & Web_site schemas Needs review , maybe you can collaborate to improve the patch over there and add legalName ?

The patch in this issue seems to already cover both issues. What do we need to do to get the functionality into the module (and close both issues)?