Graduate to k6/browser from an experimental module

[inancgumus]

What?

Provides two JS import paths:

• k6/experimental/browser: The k6 browser sync API shipped in k6 0.51 (which we're planning to remove in k6 0.54).
• k6/browser: The k6 browser async API.

Closes: #3778

Why?

• Large breaking changes are no longer expected.
• Async API w/Playwright compatibility and API stability.
• Major runtime stability issues are fixed (although there are still some minor issues).
• Tested on the cloud, and no regressions.

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)

• Browser v2: Async APIs xk6-browser#428
• Making k6/experimental/browser module part of k6 core xk6-browser#1117

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 71.87%. Comparing base (44d7840) to head (814e655).

❗ Current head 814e655 differs from pull request most recent head e4feddc

Please upload reports for the commit e4feddc to get more accurate results.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3793      +/-   ##
==========================================
+ Coverage   71.86%   71.87%   +0.01%     
==========================================
  Files         291      291              
  Lines       21249    21254       +5     
==========================================
+ Hits        15270    15277       +7     
+ Misses       4917     4915       -2     
  Partials     1062     1062              

Flag	Coverage Δ
ubuntu	71.80% <100.00%> (+<0.01%)	⬆️
windows	71.73% <100.00%> (+0.01%)	⬆️

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[ankur22]

LGTM 🙂