Centralize route matching in one place

[frandiox]

Description

This PR extracts some refactoring I did in #1933 .

So far, we were matching routes for API and, if no matched API route was found, we ran again similar logic to match Server Components. The matching process is basically iterating over every route, converting string keys to regular expressions and testing them until we find a route match.

With the changes proposed here, we only run the matching logic once at the beginning and store the result for later. It should reduce code size and CPU a little but, more importantly, it centralizes the route matching in one place so that we can implement plugins later.

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