[navermaps] Mark GL-only methods as optional on StreetLayer

[kkokkojeong]

Summary

StreetLayer.setAirWaterView and StreetLayer.isVisibleAirWaterView are only available in the NAVER Maps GL submodule, not in the standard Maps JS API.
Marking them as optional so consumers using the non-GL build are not forced to call (or assume the existence of) methods that do not exist at runtime.

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• Test the change in your own code. (Compile and run.)
• Add or edit tests to reflect the change.
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If changing an existing definition:

• Provide a URL to documentation or source code which provides context for the suggested changes:
  • https://navermaps.github.io/maps.js.ncp/docs/naver.maps.StreetLayer.html#setAirWaterView__anchor
• If this PR brings the type definitions up to date with a new version of the JS library, update the version number in the package.json.

[typescript-bot]

@kkokkojeong Thank you for submitting this PR!

This is a live comment that I will keep updated.

1 package in this PR

• navermaps — on npm, on unpkg (author is owner)
  • owner-approval: @gseok

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---

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[typescript-bot]

🔔 @ckboyjiy @Dongkyuuuu @fclemonschool @SuhwanCha @hig4342 @gseok — please review this PR in the next few days. Be sure to explicitly select Approve or Request Changes in the GitHub UI so I know what's going on.

[gseok]

LGTM

[typescript-bot]

@kkokkojeong: Everything looks good here. I am ready to merge this PR (at cc11050) on your behalf whenever you think it's ready.

If you'd like that to happen, please post a comment saying:

Ready to merge

and I'll merge this PR almost instantly. Thanks for helping out! ❤️

(@ckboyjiy, @Dongkyuuuu, @fclemonschool, @SuhwanCha, @hig4342, @gseok: you can do this too.)

[kkokkojeong]

Ready to merge