chore(cli): add --with-senders and --with-rocksdb for niche presets

[Rjected]

With the new snapshots ui we let people select / deselect these if they want it or not

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reth-cli-commands: minor
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Added `--with-senders` and `--with-rocksdb` flags to the `reth download` command, allowing users to explicitly include transaction sender static files and RocksDB index files in their downloads. Updated CLI reference docs accordingly.

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