Use CLDR plugin and loader

[agubler]

Type: feature

The following has been addressed in the PR:

• There is a related issue
• All code has been formatted with prettier
• Unit or Functional tests are included in the PR
• schema.json has been updated appropriately

Description:

Include the CLDR loader and plugin for i18n enabled applications. Add cldr-elide static has flag to elide CLDR modules from i18n itself.

Related to dojo/framework#655

Note: requires release of dojo/webpack-contrib

[codecov]

Codecov Report

Merging #371 into master will decrease coverage by 0.2%.
The diff coverage is 14.28%.

@@            Coverage Diff             @@
##           master     #371      +/-   ##
==========================================
- Coverage   48.86%   48.65%   -0.21%     
==========================================
  Files          10       10              
  Lines         702      705       +3     
  Branches      201      204       +3     
==========================================
  Hits          343      343              
- Misses        359      362       +3

Impacted Files	Coverage Δ
src/base.config.ts	19.4% <14.28%> (-0.25%)	⬇️

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