Feature/erc 8040 bundle

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[Copilot]

Pull Request Overview

This PR introduces the EIP-8040 bundle specification by adding a Protocol Buffer definition file that defines data structures for Sigstore bundle verification materials and signatures.

Key Changes:

• Adds Protocol Buffer schema for Sigstore bundle format version 0.3
• Defines structures for timestamp verification, verification materials, and bundle containers
• Includes support for multiple signature formats (DSSE envelopes and message signatures)

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File EIPS/eip-8040.md

Requires 1 more reviewers from @g11tech, @lightclient, @SamWilsn, @xinbenlv

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[agronetlabs]

"Fix typo in bundle.proto"

[agronetlabs]

Closing this PR as it's a duplicate. Consolidating all changes into PR #1313 which has a cleaner commit history (1 commit, 1 file). See #1313