[Network] Add simple queuing metrics for message sends.

[JoshLind]

Description

This PR adds simple queuing metrics to the network stack. Specifically, metrics for tracking the time between when a message is sent by the application (after serialization), until when it is finally written to the network wire.

The next set of PRs will include: (i) receiver side metrics; and (ii) support for messages with embedded timestamps for tracking transport times.

Testing Plan

Existing test infrastructure.

[trunk-io]

⏱️ 3h total CI duration on this PR

Slowest 15 Jobs	Cumulative Duration	Recent Runs
test-target-determinator	45m	🟩 🟩 🟩 🟩 🟩 (+6 more)
check-dynamic-deps	20m	🟩 🟩 🟩 🟩 🟩 (+7 more)
rust-cargo-deny	20m	🟩 🟩 🟩 🟩 🟩 (+7 more)
rust-move-tests	10m	🟩
rust-move-tests	10m	🟩
rust-move-tests	10m	🟩
rust-move-tests	10m	🟩
rust-move-tests	9m	🟩
rust-move-tests	9m	🟩
rust-move-tests	7m	🟥
rust-move-tests	7m	⬜
semgrep/ci	6m	🟩 🟩 🟩 🟩 🟩 (+7 more)
general-lints	6m	🟩 🟩 🟩 🟩 🟩 (+7 more)
rust-move-tests	3m	🟥
file_change_determinator	3m	🟩 🟩 🟩 🟩 🟩 (+7 more)

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[github-actions]

❌ Forge suite realistic_env_max_load failure on d586e08aa96914d727927bd26c61971f848c0f4d

Forge test runner terminated:
Trailing Log Lines:
             at /rustc/9b00956e56009bab2aa15d7bff10916599e3d6d6/library/std/src/panicking.rs:552:40
  34: std::panicking::try
             at /rustc/9b00956e56009bab2aa15d7bff10916599e3d6d6/library/std/src/panicking.rs:516:19
  35: std::panic::catch_unwind
             at /rustc/9b00956e56009bab2aa15d7bff10916599e3d6d6/library/std/src/panic.rs:146:14
  36: std::rt::lang_start_internal
             at /rustc/9b00956e56009bab2aa15d7bff10916599e3d6d6/library/std/src/rt.rs:148:20
  37: main
  38: __libc_start_main
  39: _start
Debugging output:
NAME                                    READY   STATUS             RESTARTS       AGE
aptos-node-0-fullnode-eforge105-0       0/1     CrashLoopBackOff   3 (37s ago)    2m11s
aptos-node-0-validator-0                1/1     Running            0              15s
aptos-node-1-fullnode-eforge105-0       0/1     CrashLoopBackOff   5 (104s ago)   7m9s
aptos-node-1-validator-0                0/1     CrashLoopBackOff   4 (32s ago)    3m31s
aptos-node-2-fullnode-eforge105-0       1/1     Running            5 (87s ago)    4m27s
aptos-node-2-validator-0                0/1     CrashLoopBackOff   5 (95s ago)    7m9s
aptos-node-3-fullnode-eforge105-0       1/1     Running            3 (37s ago)    95s
aptos-node-3-validator-0                0/1     PodInitializing    0              40s
aptos-node-4-fullnode-eforge105-0       1/1     Running            1 (4s ago)     46s
aptos-node-4-validator-0                0/1     Error              5 (107s ago)   4m27s
aptos-node-5-validator-0                0/1     CrashLoopBackOff   3 (32s ago)    2m17s
aptos-node-6-validator-0                0/1     CrashLoopBackOff   3 (31s ago)    116s
genesis-aptos-genesis-eforge105-n6lkd   0/1     Completed          0              7m11s

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