feat(start): move `scripts`,`links`, and `meta` to the `head`

[SeanCassiere]

Closes #2426

As discussed in #2426, this change adds a new method named head onto Route. This function takes in the same parameters as meta and returns the values used for scripts, links, and meta. Additionally, the loaderData argument is made to be possibly undefined as this execution may happen both before and after the loader has resolved.

The meta, links, and scripts methods on Route as being dropped and replaced by this new head method.

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commit: cca0d77