add: warning for missing keys on scene.json

[nicoecheza]

closes decentraland/sdk#951

[cloudflare-workers-and-pages]

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Latest commit:	e8399f9
Status:	✅  Deploy successful!
Preview URL:	https://784d9d3b.js-sdk-toolchain.pages.dev
Branch Preview URL:	https://add-scene-display-warning.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/add/scene-display-warning/dcl-sdk-7.3.19-6449988224.commit-1dd1b00.tgz"

• To test with npx init

  export SDK_COMMANDS="https://sdk-team-cdn.decentraland.org/@dcl/js-sdk-toolchain/branch/add/scene-display-warning/dcl-sdk-commands-7.3.19-6449988224.commit-1dd1b00.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/add/scene-display-warning/@dcl/inspector/dcl-inspector-7.3.19-6449988224.commit-1dd1b00.tgz"

• The /changerealm command to test test in-world

  /changerealm https://sdk-team-cdn.decentraland.org/ipfs/add/scene-display-warning-e2e
  

• You can preview this build entering:
  https://playground.decentraland.org/?sdk-branch=add/scene-display-warning

[codecov]

Codecov Report

Attention: 3 lines in your changes are missing coverage. Please review.

Comparison is base (bf7aa87) 71.64% compared to head (0c3d22f) 71.66%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #769      +/-   ##
==========================================
+ Coverage   71.64%   71.66%   +0.02%     
==========================================
  Files         388      388              
  Lines       12770    12783      +13     
  Branches     1728     1732       +4     
==========================================
+ Hits         9149     9161      +12     
- Misses       3415     3416       +1     
  Partials      206      206              

Files	Coverage Δ
...ges/@dcl/sdk-commands/src/commands/deploy/index.ts	22.36% <0.00%> (ø)
...s/@dcl/sdk-commands/src/logic/scene-validations.ts	97.43% <87.50%> (-2.57%)	⬇️

... and 1 file with indirect coverage changes

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