WV-3174 Provide ability to set default number of granules to display on a per layer basis

[PatchesMaps]

Description

Provide ability to set the default/initial number of granules displayed in Worldview on a per-layer basis.

How To Test

1. git checkout WV-3079-default-num-granules
2. In worldview/config/default/common/config/wv.json/layers/viirs/noaa20/VIIRS_NOAA20_CorrectedReflectance_TrueColor_Granule.json add "count": 1
3. npm run build
4. npm run watch
5. Open this link
6. Only one granule should be visible by default

PR Submission Checklist

This is simply a reminder of what we are going to look for before merging your code.

• I have read the CONTRIBUTING doc
• I have added necessary documentation (if applicable)
• I have added tests that prove my fix is effective or that my feature works (if applicable)
• Any dependent changes have been merged and published in downstream modules (if applicable)

Merging

Please use the squash and merge commit method unless each commit in your branch is vital to the commit history of main.

@nasa-gibs/worldview

[minniewong]

Can you add this parameter to the documentation? https://github.com/nasa-gibs/worldview/blob/main/doc/config/layers.md and anywhere else you see fit.