feat: expose helpers for @dcl/inspector

[cazala]

I need createEngineContext and dumpEngineToComposite helpers in order to use them from the Builder and easily create a composite using the SDK instead of building the json by hand.

[cloudflare-workers-and-pages]

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Latest commit:	0eb1118
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Preview URL:	https://ae97612f.js-sdk-toolchain.pages.dev
Branch Preview URL:	https://feat-expose-some-helpers.js-sdk-toolchain.pages.dev

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[github-actions]

Test this pull request

• The @dcl/sdk package can be tested in scenes by running

  npm install "https://sdk-team-cdn.decentraland.org/@dcl/js-sdk-toolchain/branch/feat/expose-some-helpers/dcl-sdk-7.3.1-5467589369.commit-f3f39fd.tgz"

• To test with npx init

  export SDK_COMMANDS="https://sdk-team-cdn.decentraland.org/@dcl/js-sdk-toolchain/branch/feat/expose-some-helpers/dcl-sdk-commands-7.3.1-5467589369.commit-f3f39fd.tgz"
  npx $SDK_COMMANDS init

• The @dcl/inspector package can be tested by visiting this url

  • Or by installing it via NPM

  npm install "https://sdk-team-cdn.decentraland.org/@dcl/js-sdk-toolchain/branch/feat/expose-some-helpers/@dcl/inspector/dcl-inspector-7.3.1-5467589369.commit-f3f39fd.tgz"

• The /changerealm command to test test in-world

  /changerealm https://sdk-team-cdn.decentraland.org/ipfs/feat/expose-some-helpers-e2e
  

• You can preview this build entering:
  https://playground.decentraland.org/?sdk-branch=feat/expose-some-helpers