feat: parse content steering info

[wseymour15]

Feature

Add support for parsing <ContentSteering> tags, as well as content (serverURL), the defaultServiceLocation, proxyServerUrl, and queryBeforeStart attributes associated to that tag. This also adds support for <BaseURL tag properties to be included in our parsing of playlists, but specifically for our case, we ensure the serviceLocation property is passed when it exists on a BaseURL tag.

Changes

• Return a contentSteering property on the parsed output containing the content of the tag as serverURL, as well as the other properties on the tag.
• Return a serviceLocation property in the attributes object in playlist items.
• Add support for any property on any <BaseURL> to be passed into the attributes object in playlist items.
• Add logic for eventHandler option that will handle events (to be replaced with stream parsing).
• Tests for above functionality.

References

https://datatracker.ietf.org/doc/html/draft-pantos-hls-rfc8216bis#section-4.4.6.6

[codecov[bot]]

Codecov Report

Merging #174 (42a6990) into main (9ece4ae) will increase coverage by 0.07%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #174      +/-   ##
==========================================
+ Coverage   94.58%   94.66%   +0.07%     
==========================================
  Files          19       19              
  Lines         812      824      +12     
  Branches      247      251       +4     
==========================================
+ Hits          768      780      +12     
  Misses         44       44              

Files Changed	Coverage Δ
src/index.js	85.71% <ø> (ø)
src/stringToMpdXml.js	100.00% <ø> (ø)
src/inheritAttributes.js	97.70% <100.00%> (+0.14%)	:arrow_up:
src/toM3u8.js	98.79% <100.00%> (+0.01%)	:arrow_up:

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[dzianis-dashkevich]

LGTM