enh(graphql) Add GraphQL service for indexer

enh(graphql) Add graphql service to fetch data from subsquid indexer

android/.idea/misc.xml

-<?xml version="1.0" encoding="UTF-8"?>
 <project version="4">
   <component name="ExternalStorageConfigurationManager" enabled="true" />
   <component name="ProjectRootManager" version="2" languageLevel="JDK_17" default="true" project-jdk-name="jbr-17" project-jdk-type="JavaSDK">