[feature request] Add 'params' prop to the 'A' component

Describe the bug

Not a bug, it's a feature request.

I think that it would be nice to add a params prop to the A component, for example:

<A href="/users/:id" params={{ id: userId }} />

I'm proposing this for 2 reasons:

• It seems like a nicer and more maintainable API when working with an object containing all paths. For example:

<A href={routes.user} params={{ id: userId }} />

• This would be a nice combination with named routes proposed here https://github.com/solidjs/solid-router/issues/61
  This is the API I'm thinking about:

<A name="user" params={{ id: userId }} />

When working with named routes there must be some way of providing params.

An alternative API could be

<A href={{ path: routes.user, params: { id: userId } }} />

<A href={{ name: 'user', params: { id: userId } }} />

Your Example Website or App

Steps to Reproduce the Bug or Issue

Expected behavior

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Additional context

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Start by reading the A component and the proposed named-routes issue (#61), then compare the href, name, and alternative object-shaped APIs described here. A contribution is done when the project has chosen and implemented a params API for route links with coverage for dynamic path values.