Add BYOL implementation

[lluiscastrejonsubira]

Resolves: #190

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[prigoyal]

Hi @iseessel , will you be able to update this branch purely with just your changes so that BYOL accuracy is closer than the gap in this PR? Thank you. This will allow someone else to pick up from where you are at :)

[iseessel]

@prigoyal @lluiscastrejonsubira I am closing in favor of: #454 with the updated changes -- hope that's ok. I've kept original commits (rebased ontop of current main).