add flag to keep working old observables till explroer reaches prod

[gonpombo8]

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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/observables-flag/dcl-sdk-7.4.20-8819320423.commit-1c4e302.tgz"

• To test with npx init

  export SDK_COMMANDS="https://sdk-team-cdn.decentraland.org/@dcl/js-sdk-toolchain/branch/feat/observables-flag/dcl-sdk-commands-7.4.20-8819320423.commit-1c4e302.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/observables-flag/@dcl/inspector/dcl-inspector-7.4.20-8819320423.commit-1c4e302.tgz"

• The /changerealm command to test test in-world

  /changerealm https://sdk-team-cdn.decentraland.org/ipfs/feat/observables-flag-e2e
  

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