feat(gen): use Radix tree based router

[tdakkota]

Fixes #103.

[codecov]

Codecov Report

Merging #103 (6db4831) into main (d32b505) will decrease coverage by 0.09%.
The diff coverage is 70.93%.

@@            Coverage Diff             @@
##             main     #103      +/-   ##
==========================================
- Coverage   71.70%   71.60%   -0.10%     
==========================================
  Files          70       72       +2     
  Lines        4068     4209     +141     
==========================================
+ Hits         2917     3014      +97     
- Misses        966      998      +32     
- Partials      185      197      +12     

Impacted Files	Coverage Δ
gen/write.go	84.31% <ø> (ø)
internal/ir/operation.go	44.44% <ø> (ø)
gen/router.go	41.37% <40.00%> (-29.39%)	⬇️
gen/route_tree.go	75.29% <75.29%> (ø)
gen/route_node.go	78.74% <78.74%> (ø)
gen/gen_operation.go	92.85% <100.00%> (+0.17%)	⬆️

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