refactor(runtime): cleanup, extract error to const enums

[bigopon]

📖 Description

• fix an issue with kernel package types where private properties are not marked as internal causing build errors in libs.

[codecov]

Codecov Report

Merging #1775 (29f5b1d) into master (99a6191) will increase coverage by 0.00%.
The diff coverage is 69.23%.

@@           Coverage Diff           @@
##           master    #1775   +/-   ##
=======================================
  Coverage   88.40%   88.41%           
=======================================
  Files         244      245    +1     
  Lines       22338    22307   -31     
  Branches     5172     5172           
=======================================
- Hits        19749    19722   -27     
+ Misses       2589     2585    -4     

Impacted Files	Coverage Δ
packages/runtime/src/binding/ast.visitor.ts	30.67% <ø> (ø)
packages/runtime/src/binding/connectable.ts	90.38% <0.00%> (ø)
packages/runtime/src/observation.ts	91.66% <ø> (ø)
packages/runtime/src/observation/array-observer.ts	99.39% <ø> (ø)
...time/src/observation/collection-length-observer.ts	72.50% <0.00%> (ø)
...kages/runtime/src/observation/computed-observer.ts	90.78% <0.00%> (ø)
packages/runtime/src/observation/dirty-checker.ts	96.72% <ø> (ø)
packages/runtime/src/observation/map-observer.ts	92.59% <ø> (ø)
packages/runtime/src/observation/observable.ts	95.77% <0.00%> (ø)
...ckages/runtime/src/observation/proxy-decorators.ts	100.00% <ø> (ø)
... and 15 more

... and 1 file with indirect coverage changes

📣 We’re building smart automated test selection to slash your CI/CD build times. Learn more