Upgrade to Ink 1.1.0-alpha04

[maxmmitchell]

Upgrade to the latest version of Ink as of this PR, and pull over recent updates to brush_family.proto from Ink's Github. Most applicable changes from this version increase for Cahier are:

• BrushBehavior.developerComment is now supported in the programmatic API, which will make the transition to programmatic APIs from proto builders easier.
• New ColorFunctions are available (hue, saturation, and luminosity offsets).
• Several bug fixes and documentation improvements.

BrushFamily.decode now accepts callbacks which take ByteArray? too, which prompted me to take a closer look at our calls to encode/decode. To avoid the ambiguous callsite, added typing to the callback params as well as generally standardizing calls across Cahier to be a bit more Kotlin idiomatic in our usage of the Ink storage serialization API.

[gemini-code-assist]

Code Review

This pull request updates the ink library version to 1.1.0-alpha04 in the Gradle dependencies and improves the documentation in brush_family.proto. The proto documentation updates clarify default behaviors, specify incompatibilities with SELF_OVERLAP_DISCARD, provide examples for forward and lateral position offsets, and update validation rules to match the individual start and end range fields. There are no review comments, so I have no feedback to provide.

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[cka-dev]

lgtm