152 feature add onerror hook support

[nurrony]

What does this MR do?

Add hook support for download process like below

const downloader = new HLSDownloader({
  onError: (error) => {
     console.error('error details', error);
  }
})

Error Object Details

{
  url: "<URLofTheItem>",
  name: "<ErrorName>",
  message: "<HumanReableMessage>",
}

Are there points in the code the reviewer needs to double check?

// Please add some brief description here

Why was this MR needed?

Check #147

Dependent MR Link

closes #152
closes #154
closes #155

Screenshots (if relevant)

// Please add some description here

Does this MR meet the acceptance criteria?

• Documentation created/updated
• Code Commenting
• Conform by the style guides
• Squashed related commits together

[codecov]

Codecov Report

Attention: Patch coverage is 33.33333% with 10 lines in your changes are missing coverage. Please review.

Project coverage is 78.80%. Comparing base (2eef599) to head (7dea47c).

Files	Patch %	Lines
src/Downloader.js	33.33%	6 Missing and 4 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #156      +/-   ##
==========================================
- Coverage   83.21%   78.80%   -4.41%     
==========================================
  Files           4        4              
  Lines         137      151      +14     
  Branches       15       21       +6     
==========================================
+ Hits          114      119       +5     
- Misses         12       17       +5     
- Partials       11       15       +4     

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[github-actions]

🎉 This PR is included in version 3.2.0 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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