feat: `trailingSlashes` option on the type level

[chorobin]

We can infer trailingSlashes from the router and use it to enforce the to prop when navigating.

trailingSlashes currently has three options: always | never | preserve.

always - we always have a trailing slash on leaves autocompleted with to. Branches are not affected in from as you might want a loose match on this for any leaves under a branch instead of an index route.

never - we never have a trailing slash on leaves when autocompleted on to. from does not change as mentioned in always

preserve - to autocompletes to include both trailing slash or without in the union. It can be either.

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[chorobin]

Don't merge yet. I want to add more type tests to cover over parts that could have regressed

[chorobin]

Should be ok to merge when approved