Introduce execution payload builder #6518
Merged
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PR Description
Introduces a builder for execution payload in the same vein as for BeaconBlockBody and removes the milestone specific create methods from schemas.
Also removes toVersionX() methods from ExecutionPayloadSchema as their behaviour didn't match those of ExecutionPayload.toVersionX methods (ExecutionPayloadSchema.toVersionCapella would fail for EIP4844 but ExecutionPayload.toVersionCapella would succeed for EIP4844). They are no longer used except in fuzzing which specifically needs the bellatrix schema.
Avoids the need to branch by milestone everywhere we create an ExecutionPayload.
Part of #6418
Documentation
doc-change-required
label to this PR if updates are required.Changelog