Experimental speed flag

[matt-gadd]

Type: feature

The following has been addressed in the PR:

• All code has been formatted with prettier

Adds an experimental options bag for the .dojorc. Adds a flag called speed, produces a much quicker build in dev mode at the cost of:

• no typechecking
• no legacy support
• no codesplitting
• no postcss support
• no cssnano

This flag is automatically disabled when in any other mode other than dev.

In very large projects this can mean significant gains in both cold builds and watch builds during development. An example large project -
without experimental speed flag:

$ time dojo build -m dev
 106.02 real       150.63 user         5.29 sys

with experimental speed flag:

$ time dojo build -m dev
29.01 real        46.77 user         2.26 sys

[codecov]

Codecov Report

Merging #283 into master will decrease coverage by 0.7%.
The diff coverage is 5%.

@@            Coverage Diff             @@
##           master     #283      +/-   ##
==========================================
- Coverage   51.46%   50.76%   -0.71%     
==========================================
  Files          10       10              
  Lines         647      656       +9     
  Branches      169      176       +7     
==========================================
  Hits          333      333              
- Misses        314      323       +9

Impacted Files	Coverage Δ
src/dev.config.ts	19.29% <0%> (-0.71%)	⬇️
src/base.config.ts	21.5% <0%> (-1.19%)	⬇️
src/main.ts	88.95% <100%> (+0.06%)	⬆️

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