feat: tool to validate state witness (#11388)

Completes the lifetime of state witness saved to disk:

Save latest state witnesses for given selection:
```
neard --unsafe-fast-startup view-state --readwrite state-witness latest --shard-id 4 --height 118772867 --binary > witness.txt
```

To validate it:
```
RUST_LOG=debug neard --unsafe-fast-startup view-state --readwrite state-witness validate --input-file witness.txt
```

The huge diff is explained by the need to move lots of state witness
validation code and metrics from near-client to near-chain, and it
actually belong there. Probably quick look is enough to check that I
didn't break it.

The only new logic is `ValidateWitnessCmd` which just calls existing
function for shadow validation. I checked manually that with
`RUST_LOG=debug` it shows error on invalid witness and success on the
valid one.

chain/chain/src/lib.rs

@@ -19,15 +19,15 @@ mod doomslug;
 pub mod flat_storage_creator;
 mod garbage_collection;
 mod lightclient;
-mod metrics;
+pub mod metrics;
 pub mod migrations;
 pub mod missing_chunks;
 pub mod orphan;
 pub mod resharding;
 pub mod runtime;
 mod state_request_tracker;
 pub mod state_snapshot_actor;
-mod stateless_validation;
+pub mod stateless_validation;
 mod store;
 pub mod store_validator;
 pub mod test_utils;

chain/chain/src/metrics.rs

@@ -238,36 +238,3 @@ pub(crate) static RESHARDING_STATUS: Lazy<IntGaugeVec> = Lazy::new(|| {
     )
     .unwrap()
 });
-
-pub static SAVE_LATEST_WITNESS_GENERATE_UPDATE_TIME: Lazy<HistogramVec> = Lazy::new(|| {
-    try_create_histogram_vec(
-        "near_save_latest_witness_generate_update_time",
-        "Time taken to generate an update of latest witnesses",
-        &["shard_id"],
-        Some(exponential_buckets(0.001, 1.6, 20).unwrap()),
-    )
-    .unwrap()
-});
-pub static SAVE_LATEST_WITNESS_COMMIT_UPDATE_TIME: Lazy<HistogramVec> = Lazy::new(|| {
-    try_create_histogram_vec(
-        "near_save_latest_witness_commit_update_time",
-        "Time taken to commit the update of latest witnesses",
-        &["shard_id"],
-        Some(exponential_buckets(0.001, 1.6, 20).unwrap()),
-    )
-    .unwrap()
-});
-pub static SAVED_LATEST_WITNESSES_COUNT: Lazy<IntGauge> = Lazy::new(|| {
-    try_create_int_gauge(
-        "near_saved_latest_witnesses_count",
-        "Total number of saved latest witnesses",
-    )
-    .unwrap()
-});
-pub static SAVED_LATEST_WITNESSES_SIZE: Lazy<IntGauge> = Lazy::new(|| {
-    try_create_int_gauge(
-        "near_saved_latest_witnesses_size",
-        "Total size of saved latest witnesses (in bytes)",
-    )
-    .unwrap()
-});