refactor(core): improve dev perf, fine-grained site reloads - part 3

[slorber]

Motivation

This is a follow-up of the DX improvements from:

• refactor(core): improve dev perf, fine-grained site reloads - part1 #9903
• refactor(core): improve dev perf, fine-grained site reloads - part2 #9968

The goal of this is to improve the dev experience performance.

This notably improves the little perf logging infrastructure to trace nested async calls so that we easily notice what is slow in our codebase.

It also moves some async/IO calls around to make plugin hot reloading a bit faster.

Test Plan

Unit tests + dogfood

Test links

https://deploy-preview-9975--docusaurus-2.netlify.app/

[netlify]

✅ [V2]

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🔨 Latest commit	ead5007
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[github-actions]

⚡️ Lighthouse report for the deploy preview of this PR

URL	Performance	Accessibility	Best Practices	SEO	PWA	Report
/	🟠 86	🟢 98	🟢 96	🟢 100	🟠 88	Report
/docs/installation	🟠 56	🟢 96	🟢 100	🟢 100	🟠 88	Report
/docs/category/getting-started	🟠 75	🟢 100	🟢 100	🟢 90	🟠 88	Report
/blog	🟠 67	🟢 100	🟢 100	🟢 90	🟠 88	Report
/blog/preparing-your-site-for-docusaurus-v3	🟠 61	🟢 96	🟢 100	🟢 100	🟠 88	Report
/blog/tags/release	🟠 70	🟢 100	🟢 100	🟠 80	🟠 88	Report
/blog/tags	🟠 74	🟢 100	🟢 100	🟢 90	🟠 88	Report

[github-actions]

Size Change: 0 B

Total Size: 992 kB

ℹ️ View Unchanged

Filename	Size
website/.docusaurus/globalData.json	75.4 kB
website/build/assets/css/styles.********.css	114 kB
website/build/assets/js/main.********.js	765 kB
website/build/index.html	37.9 kB

_{compressed-size-action}

[netlify]

✅ [V2]

Name	Link
🔨 Latest commit	4826a4e
🔍 Latest deploy log	https://app.netlify.com/sites/docusaurus-2/deploys/660552d91da7920008ad90bf
😎 Deploy Preview	https://deploy-preview-9975--docusaurus-2.netlify.app
📱 Preview on mobile	Toggle QR Code... Use your smartphone camera to open QR code link.

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