[17.0][ADD] Add pos_partner_birthdate_weight_mandatory module

[vehi-invitu]

cc @cvinh

[legalsylvain]

Same remark here. I think we should put the module in a dedicated repo.

[cvinh]

@vehi-invitu sorry it's a wrong push, here in OCA please push pos_partner_weight module

[github-actions[bot]]

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