Add new cli command to download public node snapshots

[joshieDo]

Describe the feature

It would be nice to have a dedicated command that only given a chain and datadir it would automatically download a public available snapshot into disk (example below).

Usage example:
reth download
reth download --chain holesky
reth download --chain holesky --datadir holesky-node
reth download --chain holesky --datadir holesky-node --url https://downloads.merkle.io/reth-2024-10-23.tar.lz4

Publicly available snapshots (both .tar.lz4):
https://snapshots.merkle.io/
https://publicnode.com/snapshots

Additional context

No response

[lean-apple]

Hello, can I work on it ?

[PedroRosalba]

Let me handle this issue!

[mrabino1]

in an ideal world, one would point to a currently running live totally sync'ed node and "trust" that node to generate a stream of a then current snapshot. point being is to not constrain ourselves to external snapshots but also trusted sister nodes that are already sync'ed.

[ABD-AZE]

@lean-apple are you still working on this?

[lean-apple]

@lean-apple are you still working on this?

Yes Im working on it, will open a PR soon.

[mymiracle0118]

Would love to tackle this!

[simlf]

Hey there, I'd really like tacle this issue.
By the way, I have worked profesionnaly on Rust in the past
Please ping me if I can contribute :)