feat: lots of changes

- move demo-app to samples and rename demo-android
- rename yukireflection to yukireflection-core
- add demo-jvm in samples
- convert yukireflection-core from android to java-library
- optimize code
- other small changes

.gitignore

@@ -1,6 +1,5 @@
 *.iml
 .gradle
-.maven
 /local.properties
 /.idea/caches
 /.idea/libraries
@@ -13,4 +12,4 @@
 /captures
 .externalNativeBuild
 .cxx
-local.properties
+local.properties