refactor!: reduce node.js dependency

[pi0]

In order to get closer to #73 this change removes support from legacy handler.

Breaking changes for event handlers:

• All handlers should be defined with eventHandler() wrapper otherwise a warning will be shown suggesting to change.
• Node.js handlers with (req, res) = {} are not automatically converted to event handler format. They can now be defined with fromNodeMiddleware((req, res) => {})
• Compatibility api to support mixed req.event / res.event is dropped

Breaking changes for app:

• app instance is not a Node.js listener (req, res) anymore. It should be converted into using toNodeListener(app) that gives a (req, res) interface from app.

[codecov]

Codecov Report

Merging #178 (7013a0e) into main (e542b07) will decrease coverage by 0.51%.
The diff coverage is 90.25%.

@@            Coverage Diff             @@
##             main     #178      +/-   ##
==========================================
- Coverage   79.72%   79.21%   -0.52%     
==========================================
  Files          18       19       +1     
  Lines        1110     1039      -71     
  Branches      205      208       +3     
==========================================
- Hits          885      823      -62     
+ Misses        225      216       -9     

Impacted Files	Coverage Δ
src/event/utils.ts	65.62% <40.00%> (-7.62%)	⬇️
src/node.ts	85.18% <85.18%> (ø)
src/app.ts	93.61% <96.29%> (+0.28%)	⬆️
src/error.ts	88.42% <100.00%> (ø)
src/event/event.ts	38.23% <100.00%> (-15.62%)	⬇️
src/event/response.ts	34.54% <100.00%> (ø)
src/index.ts	100.00% <100.00%> (ø)
src/router.ts	100.00% <100.00%> (ø)
src/types.ts	100.00% <100.00%> (ø)
src/utils/body.ts	82.89% <100.00%> (+1.56%)	⬆️
... and 10 more

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