Add development subpath to package exports (#1856)

[mxjp]

Pull Request

📖 Description

This adds a "./development" subpath to all packages under "/packages" so that dev builds can be directly imported in nodejs without using a bundler:

import { ... } from "@aurelia/runtime/development";

🎫 Issues

• package "exports" field prevents importing dev builds without a bundler #1856

👩‍💻 Reviewer Notes

📑 Test Plan

⏭ Next Steps

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (010a4ad) 88.55% compared to head (a5a0469) 88.55%.
Report is 59 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1858   +/-   ##
=======================================
  Coverage   88.55%   88.55%           
=======================================
  Files         248      248           
  Lines       22290    22290           
  Branches     5180     5180           
=======================================
  Hits        19739    19739           
  Misses       2551     2551           

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[bigopon]

Thanks @mxjp