✨ Add Ledger URL HeightRequest

[Meshiest]

✨ Feature

Support agents downloading and untarring large ledger files from CDNs or the controlplane

Motivation

• Allows nodes to start at arbitrary heights, rather than syncing from genesis
• Ergonomic way of defining where nodes start syncing from (height: https://foo/bar/baz)
• Ties into ✅ Backup Action API #165 to allow agents to restore from eachother (potentially)

Implementation

• Hook into the ledger reconciler to report status
• Use the tar crate, or this (https://rust-lang-nursery.github.io/rust-cookbook/compression/tar.html)
• Support redirects from (text file with a link to a tar file), maybe via height: aleo-snapshot (with the network derived from the storage's NetworkId)
  https://ledger.aleo.network/mainnet/snapshot/latest.txt
  https://ledger.aleo.network/testnet/snapshot/latest.txt
  https://ledger.aleo.network/canarynet/snapshot/latest.txt