Set global variables for Java tssg

Adds PROJECT_NAME_VAR and FILE_PATH_VAR

Author: rnkaufman

languages/tree-sitter-stack-graphs-java/rust/lib.rs

@@ -10,6 +10,11 @@ pub const STACK_GRAPHS_BUILTINS_CONFIG: &str = include_str!("../src/builtins.cfg
 /// The stack graphs builtins source for this language
 pub const STACK_GRAPHS_BUILTINS_SOURCE: &str = include_str!("../src/builtins.java");
 
+/// The name of the file path global variable
+pub const FILE_PATH_VAR: &str = "FILE_PATH";
+/// The name of the project name global variable
+pub const PROJECT_NAME_VAR: &str = "PROJECT_NAME";
+
 pub fn language_configuration(cancellation_flag: &dyn CancellationFlag) -> LanguageConfiguration {
     LanguageConfiguration::from_tsg_str(
         tree_sitter_java::language(),