Add validation for plugin and tasks

[sisco0]

• [ ] Because this PR includes a bug fix, relevant tests have been included.
• [x] Because this PR includes a new feature, the change was previously discussed on an Issue or with someone from the team.
• [ ] I didn't do anything of this.

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Solves #5230.

This PR ensures that tasks and plugins are validated accurately in the configuration. The enhanced test coverage ensures robustness and reliability of the validation logic

Testing output: pnpm mocha --grep "Config Validation" --recursive "test/**/*.ts"

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Name	Status	Preview	Comments	Updated (UTC)
hardhat	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jun 5, 2024 5:53pm

[alcuadrado]

Hey, thanks for submitting this PR and the other one. Unfortunately, the issue linked here refers to a new version of Hardhat that's under active development and changing too much still to be ready to accept an external PR.

We intend to have a solid base in the next few weeks/a month, which hopefully can be more welcoming for external contributors, but right now I'm afraid I'll have to close this PR.

We use the tag v-next to signal that an issue/PR is for thew new version.