Move common load methods into cldr/load/default

[mwistrand]

Type: bug

The following has been addressed in the PR:

• [x] There is a related issue
• [x] All code matches the style guide
• [x] Unit or Functional tests are included in the PR

Description:

Blocked by #67 (failing tests). cldr/load/webpack no longer includes the values imported from cldr/load in webpack builds. Separating the common methods between the two into a shared module circumvents this issue. To preserve the existing API, exports from cldr/load/default are re-exported by both cldr/load and cldr/load/webpack.

Resolves #65

[codecov[bot]]

Codecov Report

Merging #69 into master will increase coverage by 0.02%. The diff coverage is 100%.

@@            Coverage Diff             @@
##           master      #69      +/-   ##
==========================================
+ Coverage   98.88%   98.91%   +0.02%     
==========================================
  Files          10       11       +1     
  Lines         360      367       +7     
  Branches       48       48              
==========================================
+ Hits          356      363       +7     
  Partials        4        4

Impacted Files	Coverage Δ
src/cldr/load.ts	96.15% <100%> (-2.74%)	:x:
src/cldr/load/default.ts	100% <100%> (ø)

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