Pass features map down to BTR

[KaneFreeman]

Type: bug

The following has been addressed in the PR:

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

Description: Pass features map down to BTR

Dependent on https://github.com/dojo/webpack-contrib/pull/329

Resolves https://github.com/dojo/webpack-contrib/issues/306

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 43.50%. Comparing base (7b72a3f) to head (ae55ea3). Report is 12 commits behind head on master.

Files with missing lines	Patch %	Lines
src/base.config.ts	0.00%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #466 +/- ## ======================================= Coverage 43.50% 43.50% ======================================= Files 12 12 Lines 878 878 Branches 265 265 ======================================= Hits 382 382 Misses 496 496 ```

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