fix: update layout trigger to emit on first layout

[aaron-steinfeld]

Description

This change to layout triggering means a layout will be triggered on an initial render, in addition to the existing behavior of trigger on a render change. This is important as many visualizations depend on measuring their container to layout, which can't be accurately done until the parent has layed out.

Testing

Manually verified that the layout sequence produces an accurate measurement. This isn't feasible to automate, as our tests don't run with a layed out dom.

Checklist:

• My changes generate no new warnings
• [n/a] I have added tests that prove my fix is effective or that my feature works
• Any dependent changes have been merged and published in downstream modules

[codecov]

Codecov Report

Merging #345 (cd5fd1f) into main (2f413bd) will decrease coverage by 0.00%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #345      +/-   ##
==========================================
- Coverage   86.20%   86.20%   -0.01%     
==========================================
  Files         721      721              
  Lines       14684    14683       -1     
  Branches     1745     1876     +131     
==========================================
- Hits        12659    12658       -1     
+ Misses       1995     1993       -2     
- Partials       30       32       +2     

Impacted Files	Coverage Δ
...ents/src/layout/layout-change-trigger.directive.ts	100.00% <100.00%> (ø)
...pover/position-strategy/mouse-position-strategy.ts	9.67% <0.00%> (ø)

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 2f413bd...cd5fd1f. Read the comment docs.