10098 execution payload storage

[mehdi-aouadi]

PR Description

Add execution payload envelopes storage lifecycle

Fixed Issue(s)

partially #10098

Documentation

• I thought about documentation and added the doc-change-required label to this PR if updates are required.

Changelog

• I thought about adding a changelog entry, and added one if I deemed necessary.

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Note

Medium Risk
Adds new persisted data and kvstore columns for SignedBlindedExecutionPayloadEnvelope, including hot→finalized migration and pruning logic; issues could impact database consistency or finalized updates on Gloas networks.

Overview
Adds end-to-end storage support for Gloas blinded execution payload envelopes: they are now included in StorageUpdate, written to new hot/finalized kvstore columns, migrated to finalized storage during finalization, and deleted when the corresponding hot/finalized block is pruned.

Updates Spec with supportsBlobSidecars/supportsDataColumnSidecars/supportsExecutionPayloadEnvelopes feature flags and adds deserializeSignedBlindedExecutionPayloadEnvelope backed by new ExecutionPayloadEnvelopeInvariants (plus property tests) to efficiently extract slots from SSZ bytes for envelope deserialization.

Extends kvstore schema/DAO/serializers to handle SignedBlindedExecutionPayloadEnvelope (including raw SSZ passthrough when finalizing), and adds integration/unit tests covering storing, finalizing, moving, skipping-missing, and pruning envelope records.

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