NTV-465: Add audio parsing

[Arkariang]

📲 What

the HTML parser can now identify HTML pieces like:

<div class="template asset" contenteditable="false" data-id="2236466"> 
 <figure> 
  <audio controls="controls" preload="none">
   <source src="https://dr0rfahizzuzj.cloudfront.net/assets/002/236/466/f17de99e2a9e76a4954418c16d963f9b_mp3.mp3?2015" type="audio/mp3">
   <source src="https://dr0rfahizzuzj.cloudfront.net/assets/002/236/466/f17de99e2a9e76a4954418c16d963f9b_aac.aac?2015" type="audio/aac">
   <source src="https://dr0rfahizzuzj.cloudfront.net/assets/002/236/466/f17de99e2a9e76a4954418c16d963f9b_ogg.ogg?2015" type="audio/ogg">
   <source src="https://dr0rfahizzuzj.cloudfront.net/assets/002/236/466/f17de99e2a9e76a4954418c16d963f9b_webm.webm?2015" type="audio/webm">
  </audio> 
 </figure> 
</div>

• The Parser will output a AudioViewElement to the list of ViewElements

🤔 Why

• Support audio pieces on Campaign Tab

👀 See

• When loading the Campaign tab of a project take a look in logcat, you will see the AudioViewElements are present on the list with the source url recognized for "mp3" format

| | |

📋 QA

• load this project https://staging.kickstarter.com/projects/gkdreamcatcher/george-kahn-jazz-and-blues-revue-our-first-studio , take a look in logcat and should see the audio elements.
• The audio player will come in further tickets, this one scopes only the HTML parsing.

Story 📖

NTV-465

[codecov]

Codecov Report

Merging #1584 (29cb04d) into master (aff05bf) will decrease coverage by 0.01%.
The diff coverage is 47.36%.

❗ Current head 29cb04d differs from pull request most recent head 0a60dc9. Consider uploading reports for the commit 0a60dc9 to get more accurate results

@@             Coverage Diff              @@
##             master    #1584      +/-   ##
============================================
- Coverage     76.85%   76.83%   -0.02%     
- Complexity     1630     1631       +1     
============================================
  Files           356      356              
  Lines         15007    15021      +14     
  Branches       1691     1695       +4     
============================================
+ Hits          11533    11542       +9     
- Misses         2573     2576       +3     
- Partials        901      903       +2     

Impacted Files	Coverage Δ
...viewmodels/projectpage/ProjectCampaignViewModel.kt	0.00% <0.00%> (ø)
...java/com/kickstarter/libs/htmlparser/ElementExt.kt	52.00% <50.00%> (-0.09%)	⬇️
...java/com/kickstarter/libs/htmlparser/HTMLModels.kt	94.23% <100.00%> (+0.61%)	⬆️
...java/com/kickstarter/libs/htmlparser/HTMLParser.kt	93.54% <100.00%> (+0.44%)	⬆️

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[hadia]

👌😍