Allow to add file attachments to email transport with TransportBuilder

[dudzio12]

Description (*)

There is no good way to add email attachment in Magento 2.2 onwards. There are tons of multiple code gists and micro modules that implement that feature. The worst part is that it's always same code over and over with the usage of preference to rewrite core TransportBuilder class. That feature should have been implemented years ago, but better late than never. :)

Expected behavior (*)

Possibility to use addAttachment method on TransportBuilder which will allow to send email messages with one or multiple attachments.

Benefits

There will be no need to implement that feature over and over on project level.

Additional information

The core functionality will only allow developers to use addAttachment method and it won't be used by any Magento Core class, but it might change over time. For developers - it will make adding attachment's much easier, since it will be possible to add attachment with single module using plugins or single preference for specific Sender class and not preference on such frequently used class as TransportBuilder. I'll create PR just after adding this request.

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[t-heuser]

I'd love to see this feature and not have to implement it by myself!

[cavalier79]

Please add this feature

[DenisMir]

WTF Add this basic feature...

[ImanuelBertrand]

The PR to implement this (that looks to have been completed) has been closed for being backwards incompatible while I don't think it actually is BIC. I've asked for clarification in the PR but I'm not sure there will be an answer in a closed PR.