Add EIP: Preimage retention (#6873)
* Add preimage collection EIP
* set eip number + fix date
* Apply suggestions from code review
Co-authored-by: Andrew B Coathup <28278242+abcoathup@users.noreply.github.com>
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Co-authored-by: Sam Wilson <57262657+SamWilsn@users.noreply.github.com>
Co-authored-by: Andrew B Coathup <28278242+abcoathup@users.noreply.github.com>
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