Make Main.format and processArgs package-private

Only Main.main and the tests of the package call them. Code outside
the package that runs the command line in process, through
new Main(out, err, in).format(args), no longer compiles; nothing in
this repository, the Maven plugin or the GitHub Action does that.

Author: abashev

open-java-format/src/main/java/com/palantir/javaformat/java/Main.java

@@ -96,7 +96,7 @@ public static void main(String[] args) {
      *
      * @param args the command-line arguments
      */
-    public int format(String... args) throws UsageException {
+    int format(String... args) throws UsageException {
         CommandLineOptions parameters = processArgs(args);
 
         if (parameters.version()) {
@@ -251,7 +251,7 @@ private static int exitCode(boolean allOk, boolean anyChanged) {
     }
 
     /** Parses and validates command-line flags. */
-    public static CommandLineOptions processArgs(String... args) throws UsageException {
+    static CommandLineOptions processArgs(String... args) throws UsageException {
         CommandLineOptions parameters;
         try {
             parameters = CommandLineOptionsParser.parse(Arrays.asList(args));