feat: Add support for source phase imports

[bartlomieju]

Towards denoland/deno#28013

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 83.50515% with 16 lines in your changes missing coverage. Please review.

Project coverage is 81.17%. Comparing base (0c7f83e) to head (5ba0cba).
Report is 260 commits behind head on main.

Files with missing lines	Patch %	Lines
core/modules/map.rs	82.22%	16 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1081      +/-   ##
==========================================
- Coverage   81.43%   81.17%   -0.27%     
==========================================
  Files          97      101       +4     
  Lines       23877    28196    +4319     
==========================================
+ Hits        19445    22889    +3444     
- Misses       4432     5307     +875     

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[bartlomieju]

I don't think this is actually ready yet