On demand Build Time Rendering

[agubler]

Type: feature

The following has been addressed in the PR:

• There is a related issue
• All code has been formatted with prettier as per the readme code style guidelines
• Unit or Functional tests are included in the PR

Description:

Decouples build time rendering from webpack to be able to use "on demand" for a single path. Includes an express middleware that can be used to generate the static html for a visited path if it has not been generated since the last re-build. Once the html has been generated it will not re-run until the build has invalidated.

Related to dojo/cli-build-app#367

[codecov]

Codecov Report

Merging #246 into master will increase coverage by 0.42%.
The diff coverage is 98.77%.

@@            Coverage Diff             @@
##           master     #246      +/-   ##
==========================================
+ Coverage   84.80%   85.23%   +0.42%     
==========================================
  Files          48       49       +1     
  Lines        2211     2282      +71     
  Branches      586      600      +14     
==========================================
+ Hits         1875     1945      +70     
- Misses        336      337       +1     

Impacted Files	Coverage Δ
src/build-time-render/BuildTimeRender.ts	94.91% <98.50%> (+0.32%)	⬆️
src/build-time-render/BuildTimeRenderMiddleware.ts	100.00% <100.00%> (ø)

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