Add monitored scope for read_child_object (#17905)

## Description 

Describe the changes or additions included in this PR.

## Test plan 

How did you test the new or updated feature?

---

## Release notes

Check each box that your changes affect. If none of the boxes relate to
your changes, release notes aren't required.

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that describes the impact of your changes that a user might notice and
any actions they must take to implement updates.

- [ ] Protocol: 
- [ ] Nodes (Validators and Full nodes): 
- [ ] Indexer: 
- [ ] JSON-RPC: 
- [ ] GraphQL: 
- [ ] CLI: 
- [ ] Rust SDK:

sui-execution/latest/sui-adapter/Cargo.toml

@@ -20,6 +20,7 @@ move-bytecode-verifier-meter.workspace = true
 move-core-types.workspace = true
 move-vm-config.workspace = true
 move-vm-types.workspace = true
+mysten-metrics.workspace = true
 
 move-bytecode-verifier = { path = "../../../external-crates/move/crates/move-bytecode-verifier" }
 move-vm-runtime = { path = "../../../external-crates/move/crates/move-vm-runtime" }

sui-execution/latest/sui-adapter/src/temporary_store.rs

@@ -5,6 +5,7 @@ use crate::gas_charger::GasCharger;
 use move_core_types::account_address::AccountAddress;
 use move_core_types::language_storage::StructTag;
 use move_core_types::resolver::ResourceResolver;
+use mysten_metrics::monitored_scope;
 use parking_lot::RwLock;
 use std::collections::{BTreeMap, BTreeSet, HashSet};
 use sui_protocol_config::ProtocolConfig;
@@ -939,6 +940,7 @@ impl<'backing> ChildObjectResolver for TemporaryStore<'backing> {
         if obj_opt.is_some() {
             Ok(obj_opt.cloned())
         } else {
+            let _scope = monitored_scope("Execution::read_child_object");
             self.store
                 .read_child_object(parent, child, child_version_upper_bound)
         }