feat: Make createReactBasedUiSystem public

[cyaiox]

This PR updates the access modifier for the class createReactBasedUiSystem, allowing us to instantiate the system in another library, such as @dcl/asset-packs.

It also passes the playerHelper object as a param to the initializer method: initAssetPack, allowing us to access the player data from the lib @dcl/asset-packs.

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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/update-react-ecs/dcl-sdk-7.7.6-13418144862.commit-95f0b88.tgz"

• To test with npx init

  export SDK_COMMANDS="https://sdk-team-cdn.decentraland.org/@dcl/js-sdk-toolchain/branch/feat/update-react-ecs/dcl-sdk-commands-7.7.6-13418144862.commit-95f0b88.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/update-react-ecs/@dcl/inspector/dcl-inspector-7.7.6-13418144862.commit-95f0b88.tgz"

• The /changerealm command to test test in-world

  /changerealm https://sdk-team-cdn.decentraland.org/ipfs/feat/update-react-ecs-e2e
  

• You can preview this build entering:
  https://playground.decentraland.org/?sdk-branch=feat/update-react-ecs

[gonpombo8]

the only weird thing that i see here is that if the user has a UI defined in the code, then it would be overriden by the admin toolkit.