feat: slim output and bump geth

[gacevicljubisa]

Summary

• Add --slim flag (default true) emitting only the types.Log fields Bee's snapshot decoder consumes — address, topics, data, blockNumber, transactionHash — using the same hex JSON shape geth emits. Pass --slim=false to keep the full geth shape.
• Bump github.com/ethereum/go-ethereum v1.15.11 → v1.17.3 to align with Bee mainline (bee#5467).
• Add guard tests so a future geth bump that changes a kept field's encoding or adds a required field fails CI.

Why

Bee reads exported logs into types.Log via json.Decoder.Decode (see pkg/node/snapshot.go). Tracing through pkg/postage/listener/listener.go and pkg/transaction/event.go shows it only consumes the five fields above; the rest (blockHash, transactionIndex, logIndex, blockTimestamp, removed) are dropped on read. Slim mode skips them at write time, removing the random-looking blockHash hex that gzip can't dedupe. Expected ~10–15% gzipped size win.

Slim and full snapshots are decoder-interchangeable on the Bee side: geth's generated UnmarshalJSON only requires address, topics, data, transactionHash; all others are optional. Slim keeps those four plus blockNumber.