User config validation

[zoeyTM]

This PR adds validation for all the currently supported fields in HardhatUserConfig (currently just tasks and plugins).

Fixes #5230

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Name	Status	Preview	Comments	Updated (UTC)
hardhat	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jul 30, 2024 6:16am

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Latest commit: 13b133b

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[schaable]

I left a couple of comments. There are two things I'm not completely sure about:

• Doing the validations manually vs using Zod. I think this might be achievable with Zod, and it would probably look nicer. However, I haven't used Zod before, so I could be wrong.
• There are some duplicate validations between this PR and tasks. I'm inclined to say we should remove them either here or in the task manager/builders, unless these validations don't run in some scenarios.

[zoeyTM]

pushed up a commit addressing most of the comments. i'm working on a further update to validate via zod instead, but it won't be ready until tomorrow.

[zoeyTM]

After discussing pros/cons with Pato, we agreed that manual validation was the preferred choice as opposed to full config validation via zod.