unplumbing Bellatrix builder API support

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Unit Test Results

         9 files  +       3    1 077 suites  +362   39m 27s ⏱️ + 10m 32s
  3 723 tests ±       0    3 444 ✔️ ±       0  279 💤 ±  0  0 ❌ ±0 
15 874 runs  +5 306  15 569 ✔️ +5 285  305 💤 +21  0 ❌ ±0 

Results for commit af18a06. ± Comparison against base commit 706ce01.

♻️ This comment has been updated with latest results.

[tersec]

Even after #5223 https://ci.status.im/blue/organizations/jenkins/nimbus-eth2%2Fplatforms%2Fmacos%2Faarch64/detail/PR-5203/7/pipeline hits the ListKeys issue

[Suite] saveKeystore()
  [OK] Save [LOCAL] keystore after [LOCAL] keystore with same id
  [OK] Save [REMOTE] keystore after [REMOTE] keystore with same id
  [OK] Save [REMOTE] keystore after [LOCAL] keystore with same id
  [OK] Save [LOCAL] keystore after [REMOTE] keystore with same id
  [OK] Save [LOCAL] keystore after [LOCAL] keystore with different id
  [OK] Save [REMOTE] keystore after [REMOTE] keystore with different id
  [OK] Save [LOCAL] keystore after [REMOTE] keystore with different id
  [OK] Save [REMOTE] keystore after [LOCAL] keystore with different id

Wrote test_keymanager_api/bootstrap_node.enr

[Suite] Serialization/deserialization [Beacon Node] [Preset: mainnet]
  [OK] Deserialization test vectors

[Suite] ListKeys requests [Beacon Node] [Preset: mainnet]
vendor/nim-libp2p/libp2p/stream/bufferstream.nim(607) main
vendor/nim-libp2p/libp2p/stream/bufferstream.nim(597) NimMain
vendor/nim-libp2p/libp2p/stream/bufferstream.nim(588) PreMain
tests/test_keymanager_api.nim(1495) vendor/nim-testutils/testutils/unittests.nim
tests/test_keymanager_api.nim(1473) main
vendor/nim-chronos/chronos/asyncloop.nim(318) futureContinue
...

so it's at least more complicated