[State Sync] Add metrics for fast syncing chunk sizes.

[JoshLind]

Description

This PR adds additional state sync metrics to better track chunk sizes of data being fed to the storage synchronizer for fast sync.

Test Plan

Verified the metrics work manually.

[github-actions]

✅ Forge suite land_blocking success on 516efe96da355f7d1c02069fa16a503ee59552c6

performance benchmark with full nodes : 6610 TPS, 6015 ms latency, 8700 ms p99 latency,no expired txns
Test Ok

• Grafana dashboard
• Humio Logs
• Test runner output
• Test run is land-blocking

[github-actions]

✅ Forge suite compat success on testnet_2d8b1b57553d869190f61df1aaf7f31a8fc19a7b ==> 516efe96da355f7d1c02069fa16a503ee59552c6

Compatibility test results for testnet_2d8b1b57553d869190f61df1aaf7f31a8fc19a7b ==> 516efe96da355f7d1c02069fa16a503ee59552c6 (PR)
1. Check liveness of validators at old version: testnet_2d8b1b57553d869190f61df1aaf7f31a8fc19a7b
compatibility::simple-validator-upgrade::liveness-check : 7364 TPS, 5236 ms latency, 6900 ms p99 latency,no expired txns
2. Upgrading first Validator to new version: 516efe96da355f7d1c02069fa16a503ee59552c6
compatibility::simple-validator-upgrade::single-validator-upgrade : 4522 TPS, 9316 ms latency, 12100 ms p99 latency,no expired txns
3. Upgrading rest of first batch to new version: 516efe96da355f7d1c02069fa16a503ee59552c6
compatibility::simple-validator-upgrade::half-validator-upgrade : 4628 TPS, 8779 ms latency, 11600 ms p99 latency,no expired txns
4. upgrading second batch to new version: 516efe96da355f7d1c02069fa16a503ee59552c6
compatibility::simple-validator-upgrade::rest-validator-upgrade : 6878 TPS, 5725 ms latency, 9600 ms p99 latency,no expired txns
5. check swarm health
Compatibility test for testnet_2d8b1b57553d869190f61df1aaf7f31a8fc19a7b ==> 516efe96da355f7d1c02069fa16a503ee59552c6 passed
Test Ok

• Grafana dashboard
• Humio Logs
• Test runner output
• Test run is land-blocking