Add publishInfo as array

[craig-willis]

The current publishing implementation stores a single PID (DOI) on the Tale object, but allows the user to publish multiple times, losing track of previously published versions. Supporting re-publishing of a Tale seems like a desirable feature, so this PR updates the Tale model and schema to support an array of objects representing published Tale packages. I also changed the job creation to match the other gwvolman tasks (i.e., use delay())

To test:

• Checkout dashboard dataone_publishing (optional)
• Checkout gwvolman dataone_publishing (required)
• Publish a Tale
• Inspect the Tale object, note a single entry in publishInfo
• Publish Tale again
• Inspect the Tale object, note two entries with latest entry at the end

[codecov]

Codecov Report

Merging #274 into master will increase coverage by 0.5%.
The diff coverage is 100%.

@@            Coverage Diff            @@
##           master     #274     +/-   ##
=========================================
+ Coverage   86.63%   87.14%   +0.5%     
=========================================
  Files          40       40             
  Lines        2372     2364      -8     
=========================================
+ Hits         2055     2060      +5     
+ Misses        317      304     -13

Impacted Files	Coverage Δ
server/rest/tale.py	97.71% <ø> (ø)	⬆️
server/schema/misc.py	100% <100%> (ø)	⬆️
server/models/tale.py	95.49% <100%> (+3.82%)	⬆️
server/schema/tale.py	100% <100%> (ø)	⬆️
server/rest/publish.py	100% <100%> (+40%)	⬆️

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