Issue #3557911: make module 3.x compatible

Victor Dieppa Garrigarequested to merge
issue/video_embed_instagram-3557913:8.x-1.x into 8.x-1.x
  • add composer.json
  • match core_version_requirement with video_embed_field
  • Add a title attribute to the iframe tag for better accessibility
  • update renderEmbedCode variables

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