feat: export Configuration for reusing

[JounQin]

Initial checklist

• I read the support docs
• I read the contributing guide
• I agree to follow the code of conduct
• I searched issues and couldn’t find anything (or linked relevant results below)
• If applicable, I’ve added docs and tests

Description of changes

close #74

[codecov-commenter]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (245bd28) 100.00% compared to head (df2f15b) 100.00%.

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Additional details and impacted files

@@            Coverage Diff            @@
##              main       #75   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           23        23           
  Lines         2555      2560    +5     
=========================================
+ Hits          2555      2560    +5     

Impacted Files	Coverage Δ
index.js	100.00% <100.00%> (ø)
lib/configuration.js	100.00% <100.00%> (ø)
lib/file-pipeline/index.js	100.00% <100.00%> (ø)
lib/file-pipeline/parse.js	100.00% <100.00%> (ø)
lib/file-pipeline/queue.js	100.00% <100.00%> (ø)
lib/file-set-pipeline/configure.js	100.00% <100.00%> (ø)
lib/file-set-pipeline/file-system.js	100.00% <100.00%> (ø)
lib/file-set-pipeline/log.js	100.00% <100.00%> (ø)
lib/file-set-pipeline/stdin.js	100.00% <100.00%> (ø)
lib/file-set-pipeline/transform.js	100.00% <100.00%> (ø)
... and 5 more

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[wooorm]

Thanks :)