SDK: better support for SPA routing

[mquentin]

Motivation

Given
startViewCollection
When
on window.location.hash changes
Then
check if the views are different.
If the hash fragment has changed and that it is not an Anchor nav, then the views are different.

Changes

PART 1

• ✨ add a trackHash function
• ✨ modify areDifferentViews to handle hash changes

PART 2

• ✨ add a noAnchorNavHashChange check in the trackHash function that check if there is an equivalent id on one of the HTML elements

Testing

PART 1
✅ hash changes tests have been added both for pushStates and window.location.hash window.location.hash
Test with the Vue router without mode: 'history':

const router = new VueRouter({ routes })

PART 2
✅ test added that check if the hashchange is related to an Anchor nav

[codecov-commenter]

Codecov Report

Merging #467 into master will increase coverage by 0.15%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #467      +/-   ##
==========================================
+ Coverage   87.60%   87.75%   +0.15%     
==========================================
  Files          32       32              
  Lines        2025     2034       +9     
  Branches      409      411       +2     
==========================================
+ Hits         1774     1785      +11     
+ Misses        251      249       -2     

Impacted Files	Coverage Δ
packages/rum/src/viewCollection.ts	96.29% <100.00%> (+0.33%)	⬆️
packages/rum/src/performanceCollection.ts	67.21% <0.00%> (+1.63%)	⬆️
packages/rum/src/parentContexts.ts	100.00% <0.00%> (+1.78%)	⬆️

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