add podcast_length parameter to rss feed

[mattstratton]

Reproduction steps: view the RSS feed.

[mattstratton]

Still determining if this is needed.

[mattstratton]

Confirmed is needed.

https://help.apple.com/itc/podcasts_connect/#/itcb54353390

[mattstratton]

This should also have a check to see if it is isset and also if it is equal to "" - only display if it is set to a value.

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[ghost]

Thank you, everything looks good now!