Add file attributes to metadata about types HOT 11 CLOSED

@tzarebczan yes.

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I added the content duration in this pr:
https://github.com/lbryio/lbryschema/pull/24

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@KamilPiekutowski want to take another stab at this?

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@KamilPiekutowski Please let us know if there's any particular questions you have about this ticket and the other one for release date.

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after signatures

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Another to add is contentHash - this is the hash of the unencrypted file that the stream assembles into.

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@lyoshenka, @jackrobison and I ran into the real reason we need the contentHash...so one could update a claim without having the file download (metadata only) and reconstruct the file list entry with the contentHash for consistency.

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reconstruct the file list entry

not sure i understand this. what do you mean?

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Jack originally wanted to re-create the file_list entry for the edited file in stopped/incomplete mode, but then we decided not to do that. @jackrobison do we still want this?

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@jackrobison should we be adding file hash in this go around? What does it help with again?

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Nevermind, hash is in the PR.

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