[7.x] Let mailables accept a simple array of email addresses as cc or bcc

[traubisoda]

Currently we can only set a single email address, an associative array, or an object as cc or bcc in Mailables.
I think it would be nice, if it were possible just to pass a simple array of email addresses as cc/bcc. As of now, if someone has a simple array, it has to be mapped to have an email key with the address.

Example:

// This is valid
Mail::to('user@foo.com')->cc('john@doe.com')->send(new SomeMailable());

// This is valid
Mail::to('user@foo.com')->cc('john@doe.com')->send(new SomeMailable());

// This throws an exception: "Trying to get property 'email' of non-object"
Mail::to('user@foo.com')->cc(['john@doe.com', 'jane@doe.com'])->send(new SomeMailable());

// Possible workaround, me no gusta
Mail::to('user@foo.com')->cc(
  collect(['john@doe.com', 'jande@doe.com'])->map(fn ($email) => compact('email'))
)->send(new SomeMailable());

Since Mailable does not require a recipient name anywhere, and already accepts a single email address as cc/bcc, it would make sense if it accepted a simple array of addresses in my opinion.