Upgrading to new request api

[rorticus]

Type: feature

Description:

Updating the loader to use the new request API in dojo/core

Note that tests won't pass until core is released

Please review this checklist before submitting your PR:

• [ ] There is a related issue
• [x] All contributors have signed a CLA
• [x] All code matches the style guide
• [x] The code passes the CI tests
• [ ] Unit or Functional tests are included in the PR
• [ ] The PR increases or maintains the overall unit test coverage percentage
• [x] The code is ready to be merged

[codecov-io]

Codecov Report

Merging #56 into master will increase coverage by <.01%. The diff coverage is 100%.

@@            Coverage Diff             @@
##           master      #56      +/-   ##
==========================================
+ Coverage   98.81%   98.82%   +<.01%     
==========================================
  Files          10       10              
  Lines         338      339       +1     
  Branches       41       41              
==========================================
+ Hits          334      335       +1     
  Partials        4        4

Impacted Files	Coverage Δ
src/cldr/load.ts	98.46% <100%> (+0.02%)	:white_check_mark:

---

Continue to review full report at Codecov.

Legend - Click here to learn more Δ = absolute <relative> (impact), ø = not affected, ? = missing data Powered by Codecov. Last update 687874d...b971abd. Read the comment docs.