Add KSP support (moxy-compiler-ksp) alongside KAPT

[vlaushkin]

moxy-compiler-ksp is an optional KSP processor that generates the same
$$State, $$ViewStateProvider and $$PresentersBinder as KAPT, byte for byte.
The runtime loads them by name, so it's untouched and a project can switch
KAPT to KSP without code changes. KAPT stays the default.

Verified byte-for-byte against the existing goldens, and end-to-end on a real
app (~54 presenters).

Added

• moxy-compiler-ksp (JavaPoet generators, opt-in per module)
• Byte-parity tests vs the goldens, plus diagnostics and corner-case suites
• sample-app moved to KSP (Moxy + Hilt)

Changed

• Kotlin 1.4.32 → 2.4.0, AGP 4.1.3 → 9.0.1, Gradle 6.8.3 → 9.2.1
• KSP2 (symbol-processing 2.3.9), Hilt 2.60 in sample-app

moxy-compiler (KAPT) still passes its full suite on the new toolchain.

Not supported by KSP (keep KAPT)

• Un-annotated Java presenters relying on inherited @InjectViewState
• value-class params, suspend methods, properties, Java-keyword method names
• object/singleton presenters