📝 Export Token, document token types

[NatoBoram]

• Resolves [BUG]: Module @octokit/auth-token declares Token locally, but it is not exported. #398

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2 changes were made:

• Exported everything from all files Token
• Reserved index.ts for exporting the package's content

Before the change?

// Module '"@octokit/auth-token"' declares 'Token' locally, but it is not exported. ts(2459)
import type { Token } from "@octokit/auth-token"

After the change?

// It works!
import type { Token } from "@octokit/auth-token"

Pull request checklist

• Tests for the changes have been added (for bug fixes / features)
• Docs have been reviewed and added / updated if needed (for bug fixes / features)

Does this introduce a breaking change?

Please see our docs on breaking changes to help!

• Yes
• No

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[github-actions]

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[gr2m]

Token is really just a string 🤷🏼

I don't think exporting everything is a good idea, we only want to export the authentication strategy like we do with other @octokit/auth-* or octokit-auth-* packages. But you can always export types that would be useful to consumers.

[wolfy1339]

Can you split the changes into separate PRs.
I'd like to get that merged and then properly review the other changes