WIP: MSSQL bulk copy

[rasmus]

Cherry picking from #464 and inspiration from eBay.

[rasmus]

@frankebersoll what di you think about this? I was hoping to use it for huge amount of event imports as some customers would like to move their event sourcing to EventFlow, but require to move their aggregates first.

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[github-actions[bot]]

Hello there! I'm a bot and I wanted to let you know that your pull request has been closed due to inactivity after being marked as stale for seven days. If you believe this was done in error, or if you still plan to work on this pull request, please don't hesitate to reopen it and let us know. We're always happy to review and merge high-quality contributions. Thank you for your interest in our project! Best regards, EventFlow