chore: fix lib-check errors in examples

[haakonflatval-cognite]

Type of change

Jira ticket 📘

https://cognitedata.atlassian.net/browse/

Description 📝

Remove some lib check errors that have accumulated in our examples.

A recent fix in ts-loader allows us to override skipLibCheck and set it to false in examples/tsconfig.json. We have had it set to false for a while, but it has had no effect. This was fixed in ts-loader v9.4.4.

A couple of other changes have been made:

• tsconfig.json target has been set to es6. Before, it complained about the accessor keyword introduced in the PointCloudMaterial code not too long ago.
• Some types and dependencies have been updated (/ removed) to satisfy the picky lib check.
• VariableWidthLine was modified so as to not expose Line2 from three examples in its types, as it was not found by reveal/examples in compile time. Still unsure of why that was.

As a side-effect of the investigation, we have a theory that Reveal no longer supports being imported as CommonJS, because of the sparse-octree dependency which is ESM only.

How has this been tested? 🔍

Test instructions ℹ️

Checklist ☑️

• I am proud of this feature.
• I have performed a self-review of my own code.
• I have added PR type (Feat, Bug, Chore, Test, Docs, Style, Refactor) to the PR title.
• I have manually tested this for different scenarios (different models, formats, devices, browsers).
• I have commented my code in hard-to-understand areas.
• I have made corresponding changes to the public documentation.
• I have added unit and visuals tests to prove that my feature works to the best of my ability.
• I have refactored the code for readability to the best of my ability.
• I have checked that my changes do not introduce regressions in the public documentation.
• I have outlined any known defects / lacking capabilities in the contents of this PR.
• I have listed any remaining work that should follow this PR in the description or jira/miro/etc.
• I have added TSDoc to any public facing changes.
• I have added "developer documentation" in any package README.md that is related / applicable to this PR.
• I have noted down and am currently tracking any technical debt introduced in this PR.
• I have thoroughly thought about the architecture of this implementation.
• I have asked peers to test this feature.

[codecov]

Codecov Report

Merging #3370 (4ed20b0) into master (d197669) will increase coverage by 0.00%.
The diff coverage is 100.00%.

❗ Current head 4ed20b0 differs from pull request most recent head 072f00e. Consider uploading reports for the commit 072f00e to get more accurate results

@@           Coverage Diff           @@
##           master    #3370   +/-   ##
=======================================
  Coverage   71.52%   71.53%           
=======================================
  Files         344      344           
  Lines       33241    33241           
  Branches     2583     2585    +2     
=======================================
+ Hits        23776    23778    +2     
+ Misses       9361     9359    -2     
  Partials      104      104           

Impacted Files	Coverage Δ
.../packages/utilities/src/three/VariableWidthLine.ts	87.50% <100.00%> (ø)

... and 1 file with indirect coverage changes

[github-actions]

📙 Documentation preview is available from
https://cognitedata.github.io/reveal-docs-preview/3370/docs/next/.

[christjt]

Thanks for tracking this down! LGTM!