feat: added events on prerender start and finish

[rubenfig]

Added event triggers for prerender steps.
Feature required on #402

[bluepnume]

Looks good! Can we get a couple of tests please

[rubenfig]

@bluepnume Added some tests, let me know if something else is needed

[codecov-commenter]

Codecov Report

Merging #403 (3c957e6) into main (a085f40) will increase coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #403      +/-   ##
==========================================
+ Coverage   95.51%   95.53%   +0.01%     
==========================================
  Files          18       18              
  Lines        1182     1186       +4     
==========================================
+ Hits         1129     1133       +4     
  Misses         53       53              

Impacted Files	Coverage Δ
src/component/props.js	93.93% <ø> (ø)
src/constants.js	100.00% <ø> (ø)
src/parent/parent.js	95.38% <100.00%> (+0.03%)	⬆️

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[gregjopa]

Awesome work @rubenfig! 💯