Remove package.json from hardhat's tsconfig.json

[alcuadrado]

This PR removes the package.json from hardhat's tsconfig.json.

The main reason this is important is that having the pacakge.json as part of the files that tsc process means that it's copied over to dist/, bringing a few problems tsc when importing hardhat from other packages. With the dist/package.json, it incorrectly thinks that dist/ is the root of the package.

As this was probably added to support example.config.ts in hardhat/, I removed that and moved its contents to example-project/hardhat.config.ts.

[vercel]

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Name	Status	Preview	Comments	Updated (UTC)
hardhat	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jun 28, 2024 3:56pm

[changeset-bot]

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Latest commit: 9a5ebd6

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[alcuadrado]

While testing this @schaable noticed that the example-project was actually broken, as the type extensions of the builtin plugins weren't loaded. I fixed that too.

[schaable]

LGTM