add missing `stable_mev` file

beacon_chain/spec/mev/stable_mev.nim

@@ -0,0 +1,37 @@
+# beacon_chain
+# Copyright (c) 2024 Status Research & Development GmbH
+# Licensed and distributed under either of
+#   * MIT license (license terms in the root directory or at https://opensource.org/licenses/MIT).
+#   * Apache v2 license (license terms in the root directory or at https://www.apache.org/licenses/LICENSE-2.0).
+# at your option. This file may not be copied, modified, or distributed except according to those terms.
+
+{.push raises: [].}
+
+import ../datatypes/stable
+export stable
+
+type
+  StableBlindedBeaconBlockBody* {.
+      sszStableContainer: MAX_BEACON_BLOCK_BODY_FIELDS.} = object
+    randao_reveal*: Opt[ValidatorSig]
+    eth1_data*: Opt[Eth1Data]
+      ## Eth1 data vote
+
+    graffiti*: Opt[GraffitiBytes]
+      ## Arbitrary data
+
+    # Operations
+    proposer_slashings*: Opt[List[ProposerSlashing,
+      Limit MAX_PROPOSER_SLASHINGS]]
+    attester_slashings*: Opt[List[StableAttesterSlashing,
+      Limit MAX_ATTESTER_SLASHINGS_ELECTRA]]
+    attestations*: Opt[List[StableAttestation, Limit MAX_ATTESTATIONS_ELECTRA]]
+    deposits*: Opt[List[Deposit, Limit MAX_DEPOSITS]]
+    voluntary_exits*: Opt[List[SignedVoluntaryExit, Limit MAX_VOLUNTARY_EXITS]]
+
+    sync_aggregate*: Opt[SyncAggregate]
+
+    # Execution
+    execution_payload_header*: Opt[StableExecutionPayloadHeader]
+    bls_to_execution_changes*: Opt[SignedBLSToExecutionChangeList]
+    blob_kzg_commitments*: Opt[KzgCommitments]