support dynamic directory routing capabilities for SSR pages and API routes

[thescientist13]

Motivation

Coming out adding support for dynamic routing, it would be good to add support for being able to have dynamic segments for directories in file based routing paths, e.g.

src/
  pages/
    [org]/
      [team]/
        [board].js

Would match / yield the following params for this kind of route; /projectevergreen/greenwood/milestone1-0/

{
  org: 'projectevergreen',
  team: 'greenwood',
  board: 'milestone1-0'
}

Technical Design

Inspired by these implementations

• https://docs.astro.build/en/guides/routing/#rest-parameters
• https://nextjs.org/docs/pages/building-your-application/routing/dynamic-routes#catch-all-segments

Additional Context

Should also make sure to account for adapter plugins