[now dev] Implement methods in routes config

[TooTallNate]

Fixes #2148.

[codecov-io]

Codecov Report

Merging #2306 into canary will increase coverage by 0.01%.
The diff coverage is 75%.

@@            Coverage Diff             @@
##           canary    #2306      +/-   ##
==========================================
+ Coverage   10.64%   10.66%   +0.01%     
==========================================
  Files         247      247              
  Lines        9040     9042       +2     
  Branches      992      993       +1     
==========================================
+ Hits          962      964       +2     
  Misses       7963     7963              
  Partials      115      115

Impacted Files	Coverage Δ
src/commands/dev/lib/dev-server.ts	40.41% <66.66%> (ø)	⬆️
src/commands/dev/lib/dev-router.ts	79.24% <85.71%> (+0.81%)	⬆️

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