Log batch header hash hex

[ian-shim]

Why are these changes needed?

Minor update to log batch header hash as hex string instead of byte array for better legibility

Example output:

{"time":"2024-05-09T00:18:39.452095149Z","level":"INFO","source":{"function":"github.com/Layr-Labs/eigenda/core.(*StdSignatureAggregator).AggregateSignatures","file":"/home/runner/work/eigenda/eigenda/core/aggregation.go","line":176},"msg":"received signature from operator","component":"SignatureAggregator","operatorID":"3eb7d5df61c48ec2718d8c8ad52304effc970ae92f19138e032dae07b7c0d629","operatorAddress":"0xf270e0dd5a1cc34cda8fb991307604097e622002","socket":"localhost:32011;32012","quorumIDs":"[0]","batchHeaderHash":"6c4d83cbdf3a0bc2b85f4955368d80adb7fc0d432ae81a3368a81b4b4651e3e0"}

Checks

• I've made sure the lint is passing in this PR.
• I've made sure the tests are passing. Note that there might be a few flaky tests, in that case, please comment that they are not relevant.
• Testing Strategy
  • Unit tests
  • Integration tests
  • This PR is not tested :(

[jianoaix]

lgtm. Can you take this chance to fix other places as well? e.g. a quick search pointing to

eigenda/node/node.go

Line 352 in a7007f9

log.Error("Failed to delete the invalid batch that should be rolled back", "batchHeaderHash", batchHeaderHash, "err", deleteKeysErr)