feat(collector): make blob (type-3) sidecar requirement opt-in

[curcio]

📝 Summary

This pull request introduces a new configuration option to control the handling of EIP-4844 (type-3) transactions with missing blob sidecars. By default, the collector is now permissive and accepts canonical-only blob transactions, but a new flag allows restoring the previous strict validation behavior. The main changes are as follows:

Configuration and CLI changes:

• Added a new CLI flag require-blob-sidecar (and corresponding environment variable) to enable strict validation for blob transactions, rejecting those without a sidecar. This restores pre-v1.4 behavior when enabled. (cmd/collect/main.go)
• Passed the require-blob-sidecar flag through the collector and transaction processor configuration structs. (cmd/collect/main.go, collector/collector.go, collector/tx_processor.go) [1] [2] [3] [4] [5] [6] [7]

Transaction validation logic:

• Updated the blob transaction validation logic in validateBlobTx so that, by default, blob transactions without a sidecar are accepted, and strict rejection only occurs if requireBlobSidecar is set. (collector/tx_processor.go) [1] [2]

⛱ Motivation and Context

The collector's validateBlobTx rejects every EIP-4844 (type-3) transaction whose BlobTxSidecar() is nil, routing it to the trash file. In practice, this drops all blob transactions when the collector is fed by a standard Execution-Layer JSON-RPC subscription (eth_subscribe("newPendingTransactions") on geth / reth, and most public mempool feed providers).

The user-visible effect is that for collectors using JSON-RPC sources (i.e., most setups), the transactions output / ClickHouse table contains no type-3 rows at all, even though sourcelogs and other hash-level outputs do see them.

📚 References

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✅ I have run these commands

• make lint
• make test
• go mod tidy

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