chore: migrate build script from groovy to kts

- using SweetDependency, SweetProperty
- merge singing key file configs to properties
- update gradle and dependencies

.secret/.gitignore

@@ -0,0 +1 @@
+/secret.properties

.secret/key_store_secret.json

@@ -1,6 +0,0 @@
-{
-  "keyAlias": "public",
-  "keyPassword": "123456",
-  "storeFileName": "universal.p12",
-  "storePassword": "123456"
-}