feat: entry config should be defined as IndexMap

[xusd320]

Ref #1763

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[codecov]

Codecov Report

Attention: Patch coverage is 66.66667% with 1 line in your changes missing coverage. Please review.

Project coverage is 54.99%. Comparing base (3524214) to head (f0ae422).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
crates/mako/src/module_graph.rs	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1765      +/-   ##
==========================================
- Coverage   55.04%   54.99%   -0.05%     
==========================================
  Files         180      180              
  Lines       18146    18168      +22     
==========================================
+ Hits         9988     9992       +4     
- Misses       8158     8176      +18     

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