feat(initialView): empty layerIds array defaults to all layers

[DamonU2]

Closes #2370

Description

If an empty array is passed to the layerIds in initialSettings, will default to using all layers.

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

How Has This Been Tested?

https://damonu2.github.io/geoview/demos-navigator.html?config=./configs/navigator/12-a-package-swiper.json
https://damonu2.github.io/geoview/esri-dynamic.html
https://damonu2.github.io/geoview/geocore.html

Checklist:

• I have build (rush build) and deploy (rush host) my PR
• I have connected the issues(s) to this PR
• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• My changes generate no new warnings
• I have created new issue(s) related to the outcome of this PR is needed
• I have made corresponding changes to the documentation
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes

---

This change is 

[jolevesq]

Reviewed 7 of 7 files at r1, all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @DamonU2)