Migrate build from gulp to Parcel

[herzog31]

Description

• Replace gulp with parcel to simplify build process.
• Replaced lodash (with custom scope) with lodash-es which can be properly tree-shaken by parcel.
• Restore npm run dev functionality.

Motivation and Context

• Reduce complexity of build process and reduce artifact size.

How Has This Been Tested?

• Existing unit tests and example have been executed.

Screenshots (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• I have signed the Adobe Open Source CLA.
• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.22%. Comparing base (87288ff) to head (98fd622).

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #154      +/-   ##
==========================================
- Coverage   99.29%   99.22%   -0.08%     
==========================================
  Files          11       11              
  Lines         284      257      -27     
  Branches       63       63              
==========================================
- Hits          282      255      -27     
  Misses          2        2              

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