Add UID scanner functionality and related infrastructure

- Introduced a new module `uid_scanner` in userspace for managing UID scanning.
- Created a new GitHub Actions workflow for building the `user_scanner`.
- Implemented kernel communication in `throne_comm.c` and `throne_comm.h` to handle user space updates and rescan requests.
- Developed the `uid_scanner` daemon in C to scan user directories and manage UID whitelists.
- Added configuration management for the UID scanner with support for multiple users and auto-scanning.
- Implemented logging and error handling throughout the UID scanning process.
- Created necessary build files for the `user_scanner` JNI integration.
- Added a `.gitignore` file to exclude build artifacts.

kernel/core_hook.c

@@ -42,6 +42,7 @@
 #include "manager.h"
 #include "selinux/selinux.h"
 #include "throne_tracker.h"
+#include "throne_comm.h"
 #include "kernel_compat.h"
 
 #include "kpm/kpm.h"
@@ -223,6 +224,9 @@ int ksu_handle_rename(struct dentry *old_dentry, struct dentry *new_dentry)
 		new_dentry->d_iname, buf);
 
 	track_throne();
+	
+	// Also request userspace scan for next time
+	ksu_request_userspace_scan();
 
 	return 0;
 }
@@ -407,6 +411,8 @@ int ksu_handle_prctl(int option, unsigned long arg2, unsigned long arg3,
 				post_fs_data_lock = true;
 				pr_info("post-fs-data triggered\n");
 				on_post_fs_data();
+				// Initialize throne communication
+				ksu_throne_comm_init();
 				// Initializing Dynamic Signatures
         		ksu_dynamic_manager_init();
         		pr_info("Dynamic sign config loaded during post-fs-data\n");
@@ -1027,6 +1033,7 @@ void __init ksu_core_init(void)
 
 void ksu_core_exit(void)
 {
+	ksu_throne_comm_exit();
 #ifdef CONFIG_KPROBE
 	pr_info("ksu_core_kprobe_exit\n");
 	// we dont use this now