fix: update Shaka Player to use attach() method (fixes #120)

[alexbj75]

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Summary

Fixes #120 - Updates Shaka Player initialization to use the new attach() method instead of the deprecated constructor pattern with mediaElement.

Changes

• Constructor: Changed new shaka.Player(this.video) to new shaka.Player()
• Load Method: Added await this.shakaPlayer.attach(this.video) before loading source
• Added: shaka.polyfill.installAll() call in constructor
• Updated: Made load() method async to properly handle the attach operation

Problem

The current implementation uses the deprecated pattern of passing a video element to the Player constructor, which causes this warning:

Player w/ mediaElement has been deprecated and will be removed in v5.0.
We are currently at version v4.9.
Additional information: Please migrate from initializing Player with a mediaElement; use the attach method instead.

Solution

Following the Shaka Player migration guide, the player is now initialized without a media element and uses the attach() method before loading content.

Before:

this.shakaPlayer = new shaka.Player(this.video);

After:

this.shakaPlayer = new shaka.Player();
// ... later in load()
await this.shakaPlayer.attach(this.video);

Testing

• ✅ All unit tests pass
• ✅ Build succeeds for all packages
• ✅ No regressions in test coverage

Compatibility

This change ensures compatibility with Shaka Player v5.0 when it's released while maintaining backward compatibility with v4.x.

🤖 Generated with Claude Code
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