Streamline import node

[JSAbrahams]

Summary

• Get rid of FromImport
• Get rid of ImportAs

[codecov[bot]]

Codecov Report

Merging #309 (998fb61) into develop (6aaf2a1) will decrease coverage by 0.24%. The diff coverage is 76.21%.

@@             Coverage Diff             @@
##           develop     #309      +/-   ##
===========================================
- Coverage    86.52%   86.28%   -0.25%     
===========================================
  Files          104      105       +1     
  Lines        10881    10825      -56     
===========================================
- Hits          9415     9340      -75     
- Misses        1466     1485      +19     

Impacted Files	Coverage Δ
src/check/constrain/generate/definition.rs	91.55% <ø> (+1.68%)	:arrow_up:
src/check/constrain/generate/mod.rs	90.32% <ø> (ø)
src/generate/convert/call.rs	68.75% <0.00%> (-15.87%)	:arrow_down:
src/generate/convert/control_flow.rs	90.57% <0.00%> (-2.02%)	:arrow_down:
src/generate/convert/handle.rs	59.57% <0.00%> (-14.11%)	:arrow_down:
src/generate/convert/ty.rs	68.00% <0.00%> (-9.28%)	:arrow_down:
src/parse/ast/node.rs	79.33% <62.50%> (+0.08%)	:arrow_up:
src/generate/convert/class.rs	87.79% <69.23%> (-1.51%)	:arrow_down:
src/generate/convert/definition.rs	89.51% <69.23%> (-1.19%)	:arrow_down:
src/generate/convert/range_slice.rs	85.29% <85.29%> (ø)
... and 12 more

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[JSAbrahams]

Decrease in coverage because we have removed some logic which was mostly covered.