BREAKING(http/unstable): move route module to unstable-route

[kt3k]

part of #5920

This PR moves route to ./unstable-route.

We usually do not re-export unstable APIs from mod.ts, but in this case I suggest we should keep it (at least for a while) as it's used in deno init --serve output.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.32%. Comparing base (8d7e184) to head (47b91ae).
Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5939      +/-   ##
==========================================
- Coverage   96.32%   96.32%   -0.01%     
==========================================
  Files         483      483              
  Lines       39403    39403              
  Branches     5838     5838              
==========================================
- Hits        37956    37953       -3     
- Misses       1405     1408       +3     
  Partials       42       42              

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[iuioiua]

Shouldn't this be marked as "BREAKING(http/unstable)"?

[kt3k]

Ok. Let's use BREAKING(pkg/unstable) pattern

Note: Deno CLI seems using the same pattern for breaking changes in unstables https://github.com/denoland/deno/blob/main/Releases.md#1460--20240822