[now dev] Bundle canary builders for Now CLI canary

[TooTallNate]

Closes #2641.

I'm still adding unit tests for the "filter" function since the logic is not very straightforward and there's many edge cases.

[codecov-io]

Codecov Report

Merging #2661 into canary will increase coverage by 0.22%.
The diff coverage is 61.53%.

@@            Coverage Diff            @@
##           canary   #2661      +/-   ##
=========================================
+ Coverage    7.85%   8.07%   +0.22%     
=========================================
  Files         259     259              
  Lines       10404   10453      +49     
  Branches     1319    1323       +4     
=========================================
+ Hits          817     844      +27     
- Misses       9534    9552      +18     
- Partials       53      57       +4

Impacted Files	Coverage Δ
src/util/dev/server.ts	11.76% <0%> (+0.24%)	⬆️
src/util/dev/builder-cache.ts	39.9% <64%> (+7.1%)	⬆️
src/util/prefer-v2-deployment.ts	62.85% <0%> (-8.12%)	⬇️
src/util/metrics.ts	61.53% <0%> (-6.65%)	⬇️
src/util/dev/router.ts	75.71% <0%> (-4.59%)	⬇️
src/util/output/create-output.ts	27.08% <0%> (-2.47%)	⬇️
src/util/get-files.ts	86.26% <0%> (-0.82%)	⬇️
src/util/dev/builder.ts	12.16% <0%> (-0.27%)	⬇️
... and 1 more

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[AndyBitz]

The code looks good, but I'm wondering if it would make sense to include both versions for Now CLI canary, since I don't think that just because someone uses Now CLI canary they'd like to use canary builders as well

[TooTallNate]

@AndyBitz I'd rather not, as there's not really a "clean" way to accomplish that without including two tarballs (one for stable and one for canary) and would make the logic more complicated.

Users can still use stable builders, the installPackages() function blocks to ensure correctness before booting up the now dev server.