feat(ast): getExportProps() supports more common export syntax

[imhele]

Checklist

• npm test passes
• tests are included
• documentation is changed or added
• commit message follows commit guidelines

Description of change

• support for extracting functions declaration from export
• support for extracting directly exported values

[codecov]

Codecov Report

Merging #4354 into master will increase coverage by 0.30%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #4354      +/-   ##
==========================================
+ Coverage   82.63%   82.94%   +0.30%     
==========================================
  Files         138      138              
  Lines        2724     2773      +49     
  Branches      686      695       +9     
==========================================
+ Hits         2251     2300      +49     
  Misses        464      464              
  Partials        9        9              

Impacted Files	Coverage Δ
packages/ast/src/getExportProps/getExportProps.ts	100.00% <100.00%> (ø)
...ackages/ast/src/getExportProps/propertyResolver.ts	100.00% <100.00%> (ø)
packages/core/src/Route/getConventionalRoutes.ts	98.83% <100.00%> (+0.01%)	⬆️

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