perf: Intern easings and route properties by id across the transition JNI

[MatiPl01]

Makes the hot per-transition JNI call all-primitive. Easing curves are registered once per distinct curve (cssDefineEasing) and referenced by id afterwards, and properties map to compile-time int ids on both sides, so starting a transition no longer allocates a jstring and two jfloatArrays per call - at heavy churn (hundreds of views re-rendering many times per second) that removed tens of thousands of transient Java objects per second from the GC.

The Kotlin interpolator cache disappears with it: the interpolator is resolved once when the easing is defined and carried in the start command. The intern table is capped; an app computing easing points at runtime past the cap falls back to the loop path through the existing demotion contract, which plays any easing.

Commands now carry their (viewTag, propertyId) key directly, so pending-command checks and the flush dispatch read as one-liners.

[coderabbitai]

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[MatiPl01]

Superseded by #10169, which applies the same interning on top of the mount-gated repair (#10168) and below the frame pump (#10170).