fix: update dial function return type to avoid Connection import issue

[nickreynolds]

• I've noticed an issue when including this package in another typescript project. The index.d.ts file created during the build process would include an in-line import in the dial function declaration of Promise<import("@libp2p/interface-connection/dist/src").Connection>;
• This would result in the following build error in my project:
  ../../node_modules/@libp2p/websockets/dist/src/index.d.ts(19,104): error TS2694: Namespace '"@libp2p/interface-connection/dist/src"' has no exported member 'Connection'.
• By declaring the Connection import explicitly, we avoid the strange in-line import of a dist/src location and I am able to build my project correctly.

I believe it is possible that this issue: #163 is also the result of the behavior I was seeing, and this PR may resolve that issue.

[achingbrain]

Thanks for opening this, I'm not sure why tsc gets the import paths wrong. Hopefully merging this will prevent this sort of thing in the future.

[github-actions]

🎉 This PR is included in version 3.0.2 🎉

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• npm package (@latest dist-tag)
• GitHub release

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