refactor(v2): replace Lodash with single methods packages in core

[Simek]

Motivation

Thi is the second part of core V2 Lodash refactor (#2529). In this PR lodash package is replaced by single method counterparts.

Only few usages of Lodash in docusaurus-utils is preventing me from removing @types/lodash from the workspace package.json. I'm going to work on that part next.

Have you read the Contributing Guidelines on pull requests?

Yes

Test Plan

Same test results before and after code refactor.

Related PRs

• refactor(v2): use single method package instead of whole Lodash package in blog plugin #2460
• chore(v2): use single method Lodash packages in docs plugin #2519
• chore(v2): replace few Lodash methods with native counterparts #2520
• refactor(v2): replace few Lodash methods with native counterparts #2529

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[yangshun]

We need to add the TypeScript types to package.json also:

+  "@types/lodash.has": "^4.5.6",
+  "@types/lodash.isplainobject": "^4.0.6",
+  "@types/lodash.isstring": "^4.0.6",

This is quite troublesome and IMO one downside to this approach.

[Simek]

@yangshun Lodash + TS, what can you do 😞 I hope this requirement force devs NOT to use new Lodash methods and there be someone (in the future) who will tackle absolute Lodash removal.