feat: loading and template file convention

[hi-ogawa]

todo

• remount by url
• remount only by next segment change
• test loading
• test template
• for some reason, seemingly unrelated /test/session ssr is failing on cf where there's no flight stream script.
  • fixed (workarounded?) in fix: fix ssr flight stream injection by buffering #457

[hi-ogawa]

• feat: loading and template file convention #456 : 2 dependent PRs (#457 , #458 ) 👈
• feat: not-found file convention #454
• main

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[hi-ogawa]

Merge activity

• Jun 29, 8:57 PM EDT: @hi-ogawa started a stack merge that includes this pull request via Graphite.
• Jun 29, 8:58 PM EDT: Graphite rebased this pull request as part of a merge.
• Jun 29, 8:59 PM EDT: @hi-ogawa merged this pull request with Graphite.