#10758: Support for Cesium Ion Terrain Provider

[dsuren1]

Description

This PR adds support for cesium ion terrain provider

Please check if the PR fulfills these requirements

• The commit message follows our guidelines: https://github.com/geosolutions-it/MapStore2/blob/master/CONTRIBUTING.md
• Docs have been added / updated (for bug fixes / features)

What kind of change does this PR introduce? (check one with "x", remove the others)

• Enhancement

Issue

What is the current behavior?

• Add support for Cesium Ion Terrain Provider #10758

What is the new behavior?
With new cesium-ion provider, ion resource based on the asset is loaded in cesium map view

Test data

Test cesium-ion-terrain with this context /context/cesium-ion-terrain, for access token refer to support ticket

Configuration

{
  "type": "terrain",
  "visibility": true,
  "provider": "cesium-ion",
  "options": {
    "assetId": 1,
    "accessToken": "",
  }
}

Breaking change

Does this PR introduce a breaking change? (check one with "x", remove the other)

• Yes, and I documented them in migration notes
• No

Other useful information