voice: replace Whisper with sherpa-onnx, live words from Kroko and the final words from Parakeet

Models download in Settings instead of shipping in the APK. Credits for the engine and models are in About.

gearslip/src/main/java/com/k2fsa/sherpa/onnx/HomophoneReplacerConfig.kt

@@ -0,0 +1,8 @@
+// From sherpa-onnx v1.13.8 (Apache-2.0, https://github.com/k2-fsa/sherpa-onnx), kotlin-api.
+package com.k2fsa.sherpa.onnx
+
+data class HomophoneReplacerConfig(
+    var dictDir: String = "", // unused
+    var lexicon: String = "",
+    var ruleFsts: String = "",
+)