MetadataCollector should emit version information and accept future version content.

[chuckjaz]

• I'm submitting a ...
• feature request

The StaticResolver should be able to adapt to changes in the .metadata.json file format. This requires

• A version number in the .metadata.json file.
• Optionally, at the root, multiple versions of the metadata in an array.
• StaticResolver should be prepared for the array and look for the metadata version it supports.

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