Implement missing WebAudio automation student project

Implement support for missing WebAudio automation

Background information: Major browsers support the WebAudio standard which can be used to create complex media playback applications from low-level building blocks. Servo is a new, experimental browser that supports some of these building blocks (called audio nodes); the goal of this project is to implement some missing audio processing algorithms and interfaces to improve compatibility with existing multimedia content on the web.

Tracking issue: (please ask questions in these issues)

• https://github.com/servo/media/issues/204 (value curve automation)
• https://github.com/servo/servo/issues/22897 (JS API for value curves)
• https://github.com/servo/servo/issues/22898 (missing APIs for AudioListener)
• https://github.com/servo/media/issues/205 (wave shaper node)

Useful references:

• Setup for modifying the standalone media backend implementation
• Implementation of audio node processing algorithms
• Runnable examples of audio node processing algorithms
• Example pull request implementing a missing node type in Servo (another example)
• Example pull request implementing the processing backend for a missing node type
• Setup for making changes to Servo's code
• Documentation for introducing new WebIDL-based DOM interfaces to Servo
• Documentation for integrating a version of servo-media that contains your local changes into your local Servo build

Initial steps:

• email the mozilla.dev.servo mailing list (be sure to subscribe to it first!) introducing your group and asking any necessary questions
• Add the new ValueCurveAtTime automation event and implement the processing algorithm for it (per the github issue)
• Create an example program (in examples/) that demonstrates this automation being applied to an oscillator node

Subsequent steps:

• Implement the missing JS API for setValueCurveAtTime per the github issue
• Implement the missing setPosition and setOrientation APIs per the github issue
• update the expected test results for the relevant tests
• implement the backend for WaveShaperNode in the media crate by creating a new node implementation using BiquadFilterNode as a guide. Create an example program that demonstrates the effect in practice.