Initial commit for Signature Aggregation RIP-7560 transaction subtypes#2

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RIP7560-signature-aggregation-subtypes

Commits on Mar 19, 2024

Commits on Apr 9, 2024

Update RIPS/rip-9998.md

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yoavw
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Commits on May 3, 2024

Added the illustration of a block; moved aggreation tx to end of validation
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