feat: precommit hook for google java format

hooks/README.md

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+# Useful hooks in this project
+To use, just add the content of the wanted hook in `.git/hook/pre-commit`. You may need to use `chmod +x pre-commit`

hooks/google-java-format

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+#!/bin/bash
+
+# Path to the Google Java Formatter JAR
+FORMATTER_JAR="$HOME/.local/share/java/google-java-format.jar"
+
+# Download the Google Java Formatter JAR if it doesn't exist
+if [ ! -f "$FORMATTER_JAR" ]; then
+  echo "Downloading Google Java Formatter..."
+  mkdir -p "$(dirname "$FORMATTER_JAR")"
+  curl -L -o "$FORMATTER_JAR" https://github.com/google/google-java-format/releases/download/v1.20.0/google-java-format-1.20.0-all-deps.jar
+fi
+
+# Format all staged Java files
+STAGED_JAVA_FILES=$(git diff --cached --name-only --diff-filter=ACM | grep "\.java$")
+
+if [ -n "$STAGED_JAVA_FILES" ]; then
+  echo "Formatting Java files..."
+  java -jar "$FORMATTER_JAR" --skip-sorting-imports --skip-reflowing-long-strings --aosp --replace $STAGED_JAVA_FILES
+
+  # Re-stage the formatted files
+  git add $STAGED_JAVA_FILES
+fi
+
+exit 0