ESM upgrade

[jsanz]

I wanted to upgrade dependencies in this repo and started shaving a yak :sweat_smile:. I ended up having to upgrade from CommonJS to ESM to upgrade JSTS.

• General upgrade of all dependencies
• Upgraded code to ESM modules, replacing the require statements by import.
• For JSTS, this upgrade meant that the isSimple, isValid, and buffer methods needed to be imported separately and used as class instances that received the geometry and applied that operation.
• Upgraded eslint: removing old style configuration files in favor of a flat eslint.config.js file.
• Upgrading lodash to lodash-es and getting the required functions as individual imports instead of the global underscore.
• mapshaper does not provide a rf7946 output option anymore, using the precision parameter, yielding the exact same outputs.

[!note] I've left a few comments in the files to try to give more details on the changes.

[elasticmachine]

:green_heart: Build Succeeded

• Buildkite Build
• Commit: bfca8a38d07b65f56e5897a49891f3a2d653bb12

History

• :green_heart: Build #145 succeeded 16a0c73bb9568aa41f8582afbd69c96a5a4713ab
• :green_heart: Build #144 succeeded a824866caa161034454e5341a9c7bf8d4d28cf87
• :green_heart: Build #143 succeeded cd4a114ce32a5a5f8991b0e63096694dfd1f1740
• :broken_heart: Build #142 failed f76953d9d7005de797ec6c2fee854f09665c6382

[jsanz]

💚 All backports created successfully

Status	Branch	Result
✅	feature-layers

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