Native ESM support

[mstoykov]

What?

Native support for ESM in k6

Why?

Having native ESM support both allows us to use more goja features and drops our internal babel.

Checklist

• I have performed a self-review of my code.
• I have added tests for my changes.
• I have run linter locally (make lint) and all checks pass.
• I have run tests locally (make tests) and all tests pass.
• I have commented on my code, particularly in hard-to-understand areas.

Related PR(s)/Issue(s)

Closes #3265

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 79.41176% with 63 lines in your changes are missing coverage. Please review.

Project coverage is 73.58%. Comparing base (3a7bf2c) to head (ab63cf5).
Report is 2 commits behind head on master.

❗ Current head ab63cf5 differs from pull request most recent head 27973ce. Consider uploading reports for the commit 27973ce to get more accurate results

Files	Patch %	Lines
js/modules/require_impl.go	61.29%	27 Missing and 9 partials ⚠️
js/modules/cjsmodule.go	80.48%	7 Missing and 1 partial ⚠️
js/modules/resolution.go	84.61%	5 Missing and 3 partials ⚠️
js/modules/gomodule_basic.go	75.00%	3 Missing and 2 partials ⚠️
js/modules/gomodule.go	91.17%	3 Missing ⚠️
js/bundle.go	92.00%	1 Missing and 1 partial ⚠️
js/compiler/compiler.go	96.15%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3456      +/-   ##
==========================================
+ Coverage   73.57%   73.58%   +0.01%     
==========================================
  Files         277      276       -1     
  Lines       20234    20322      +88     
==========================================
+ Hits        14887    14954      +67     
- Misses       4399     4414      +15     
- Partials      948      954       +6     

Flag	Coverage Δ
ubuntu	73.58% <79.41%> (+0.08%)	⬆️
windows	?

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