[Ownable] Allow non msg-sender ownable to initialize contract as Owner

[iainnash]

🧐 Motivation
Recently, I've been using Ownable and OwnableUpgradeable to set ownership of contracts other than the deployer.

The pattern used is something like:

constructor(address newOwner) {
  transferOwnership(newOwner);
}

Which emits to transferOwnership events.

Especially for upgradable contracts this is useful.

📝 Details

Add in a new constructor argument to the upgradeable contracts that allows a different initial owner to be set.

[Amxx]

Hello @iainnash

This has already been discussed in
#2402
#2639
#2647

[iainnash]

Whoops @Amxx my bad, i was thinking of posting on contracts-upgradeable since the function overloading issue doesn't exist with that fork and this is a more common issue. However, i'm not sure if that works with the idea that the fork needs to be 100% compat with this core version.