Fix missing babylon types

[trusktr]

[!Note] This is branched off of the branch for

• #183

See that PR first. For convenience, here's the diff between the branches, as the Files changed tab will not be useful.

Description

Babylone.js types were not visible within the Babylon host code.

Before:

After:

Related Issue #

• closes https://github.com/aws-samples/amazon-sumerian-hosts/issues/189

Reviewer Testing Instructions

Run npm install && npm run compile-ts at the root of the repo. Then open packages/amazon-sumerian-hosts-babylon/src/Babylon.js/HostObject.js and hover on Babylon APIs and you will see helpful tooltips showing types.

Submission Checklist

I confirm that I have...

• [x] removed hard-coded Cognito IDs
• [x] manually smoke-tested the BabylonJS integration tests
• [x] manually smoke-tested the BabylonJS demos
• [x] manually smoke-tested the Three.js integration tests
• [x] manually smoke-tested the Three.js demo

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