Implement downloading the chain storage

[tomaka]

cc #165

Adds a mode to the warp_sync where, instead of downloading just the runtime and then the consensus-related information, we download the entire storage of the chain.

To achieve this, the StorageGet requests have been renamed to StorageGetKeys, and a new StorageGetRange request has been added.

Works for Westend. For Polkadot I'm getting UnexpectedEntriesCount errors which I can't manage to solve at the moment.
This needs to be solved, and this PR needs a bit of clean up, before being ready for review/merging. However it is 90% ready.

[mergify]

Automatically approving tomaka's pull requests. This auto-approval will be removed once more maintainers are active.

[tomaka]

Another thing to note is that at the moment we use the "no proof" version of the network protocol.
However, as I'm implementing this PR, I've stumbled upon some tricky safety issues that would be solved if we used the "with proof" version of the protocol.
So we might change this before merging.

[github-actions]

twiggy diff report

Difference in .wasm size before and after this pull request.

---

 Delta Bytes │ Item
─────────────┼──────────────────────────────────────────────────────────────────────────────────────────────────────
       +8809 ┊ <core::future::from_generator::GenFuture<T> as core::future::future::Future>::poll::h795f7045dc5d1da5
       -8588 ┊ <core::future::from_generator::GenFuture<T> as core::future::future::Future>::poll::h3d4e690099240d8a
       -5708 ┊ <core::future::from_generator::GenFuture<T> as core::future::future::Future>::poll::h233d14a70f39b769
       +5708 ┊ <core::future::from_generator::GenFuture<T> as core::future::future::Future>::poll::h3a74d5eaea3b2301
       +3918 ┊ <core::future::from_generator::GenFuture<T> as core::future::future::Future>::poll::h9e35c363097b7b55
       +3910 ┊ smoldot_light::sync_service::standalone::Task<TPlat>::inject_network_event::h4037b49ef2b6f64b
       -3910 ┊ smoldot_light::sync_service::standalone::Task<TPlat>::inject_network_event::he38c6bf2e66ec472
       -3734 ┊ <core::future::from_generator::GenFuture<T> as core::future::future::Future>::poll::h0e11a7d80a855012
       +3556 ┊ <core::future::from_generator::GenFuture<T> as core::future::future::Future>::poll::h8e360ca87fb9c5fb
       -3556 ┊ <core::future::from_generator::GenFuture<T> as core::future::future::Future>::poll::hbb7d95b1ee9ed0b6
       +3246 ┊ smoldot_light::sync_service::standalone::Task<TPlat>::start_next_request::h8d92e48e4934f874
       -3227 ┊ <core::future::from_generator::GenFuture<T> as core::future::future::Future>::poll::h50f061f0ad7e5727
       +3227 ┊ <core::future::from_generator::GenFuture<T> as core::future::future::Future>::poll::h88262e23ee85068d
       +2860 ┊ smoldot::sync::warp_sync::VerifyStorage<TSrc,TRq>::verify::hc5aa519292cb189f
       -2728 ┊ smoldot_light::sync_service::standalone::Task<TPlat>::start_next_request::h973f318cb6c022c7
       -2577 ┊ <core::future::from_generator::GenFuture<T> as core::future::future::Future>::poll::h1057ed3a217c53d9
       +2577 ┊ <core::future::from_generator::GenFuture<T> as core::future::future::Future>::poll::hcc5840e6931b361e
       +2483 ┊ <core::future::from_generator::GenFuture<T> as core::future::future::Future>::poll::h0cf618a8e6a8f5c6
       -2483 ┊ <core::future::from_generator::GenFuture<T> as core::future::future::Future>::poll::h454061b20ee19b01
       +2277 ┊ smoldot::sync::warp_sync::BuildRuntime<TSrc,TRq>::build::h3ec15337145eeabc
      +39576 ┊ ... and 1015 more.
      +84354 ┊ Σ [1035 Total Rows]

[tomaka]

Doesn't work due to the lack of child tries support.

[tomaka]

I'm going to update this PR to use the "proof version" of the request, and afterwards I would like to merge it.
We're going to need state requests in order to properly implement the state_getKeysPaged RPC function without running into situations where the storage response is too large.