Enhancement: onUpdate and onDetach APIs for dom pragma

[agubler]

Type: feature

The following has been addressed in the PR:

• There is a related issue
• All code has been formatted with prettier as per the readme code style guidelines
• Unit or Functional tests are included in the PR

Description:

Adds two new APIs for the dom pragma, onUpdate and onDetach that are called when the dom node is updated and removed respectively. This will enable support for integrations such as mounting a react component within a Dojo application.

Resolves #828

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[codecov]

Codecov Report

Merging #829 into master will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #829   +/-   ##
=======================================
  Coverage   97.64%   97.64%           
=======================================
  Files         127      127           
  Lines        8034     8040    +6     
  Branches     1861     1864    +3     
=======================================
+ Hits         7845     7851    +6     
  Misses        189      189           

Impacted Files	Coverage Δ
src/core/vdom.ts	98.07% <100.00%> (+<0.01%)	⬆️

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