feat(Link): add react-router link integration

[billhimmelsbach]

Closes: https://github.com/cfpb/sbl-frontend/issues/117

Well this took some experimentation, but we got there. Allows Link to use a isRouterLink prop to convert them to react-router links with minimal hassle.

Changes

• add react-router-dom as an external dependency in the vite config, since react-router needs its links to share the same instance of the library to work. Works in concert with this change in sbl-frontend. What a pain this was. (Also, I added a maybe missing react-dom from the optimizeDeps.exclude array for good measure)
• add a isRouterLink prop that switches Link to using react-router Links
• fixes some Typescript errors
• adds a story for isRouterLink prop called "Link using React Router Link"

How to test this PR

1. Does the isRouterLink story "Link using React Router Link" render without errors?

Screenshots

Notes

• I could have also added a NavLink option, but I don't think we have a use case for it since we have some similar logic built out already. I made a ticket for it, in case we want to add it in.
• Enables this PR on sbl-frontend: https://github.com/cfpb/sbl-frontend/pull/201

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[billhimmelsbach]

Thanks @meissadia! I appreciate the thinking about the naming.