🏷️ Improve DX of exported types and export the missing ones.

[govind-srinidhi]

• It would create a better developer experience if the consumer can access the types directly from @adyen/lume instead of navigating it from dist/
• Exported the missing types and make it accessible for consumers.
• Using import type for importing the type definitions.

Relates to #401

📝 Description

Currently the consumer can access Lume types only by navigating the /dist folder something like @adyen/lume/dist/@types/...

It would create a better developer experience if the user can access the types directly from @adyen/lume instead of navigating the entire path.

And certain types for instance AlluvialDiagramOptions are not exported in Vue 2 version of Lume library. Need to go through the list of missing types and export them too.

💥 Is this a breaking change (Yes/No):

• [x] No
• [ ] Yes (please describe the impact and migration path for existing Lume users)

Before submitting the PR, please make sure you do the following

• [x] Read the Contributing Guidelines.
• [x] Check that there isn't already a PR that solves the problem the same way to avoid creating a duplicate.
• [x] Provide a description in this PR that addresses what the PR is solving, or reference the issue that it solves (e.g. fixes #123).
• [x] Ideally, include relevant tests that fail without this PR but pass with it.

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