Move service API from TactilityKernel to service-module (#604)

Extracted the service API from TactilityKernel and put it in a new module at `Modules/service-module`

Modules/service-module/source/paths.cpp

@@ -0,0 +1,62 @@
+// SPDX-License-Identifier: Apache-2.0
+
+#include <service/paths.h>
+#include <tactility/paths.h>
+
+#include <cstdio>
+
+extern "C" {
+
+error_t service_paths_get_user_data_directory(const char* service_id, char* out_path, size_t out_path_size) {
+    char root[192];
+    error_t error = paths_get_user_data_path(root, sizeof(root));
+    if (error != ERROR_NONE) {
+        return error;
+    }
+    int written = std::snprintf(out_path, out_path_size, "%s/service/%s", root, service_id);
+    if (written < 0 || (size_t)written >= out_path_size) {
+        return ERROR_BUFFER_OVERFLOW;
+    }
+    return ERROR_NONE;
+}
+
+error_t service_paths_get_user_data_path(const char* service_id, const char* child_path, char* out_path, size_t out_path_size) {
+    char directory[224];
+    error_t error = service_paths_get_user_data_directory(service_id, directory, sizeof(directory));
+    if (error != ERROR_NONE) {
+        return error;
+    }
+    int written = std::snprintf(out_path, out_path_size, "%s/%s", directory, child_path);
+    if (written < 0 || (size_t)written >= out_path_size) {
+        return ERROR_BUFFER_OVERFLOW;
+    }
+    return ERROR_NONE;
+}
+
+error_t service_paths_get_assets_directory(const char* service_id, char* out_path, size_t out_path_size) {
+    char directory[224];
+    error_t error = service_paths_get_user_data_directory(service_id, directory, sizeof(directory));
+    if (error != ERROR_NONE) {
+        return error;
+    }
+    int written = std::snprintf(out_path, out_path_size, "%s/assets", directory);
+    if (written < 0 || (size_t)written >= out_path_size) {
+        return ERROR_BUFFER_OVERFLOW;
+    }
+    return ERROR_NONE;
+}
+
+error_t service_paths_get_assets_path(const char* service_id, const char* child_path, char* out_path, size_t out_path_size) {
+    char directory[224];
+    error_t error = service_paths_get_assets_directory(service_id, directory, sizeof(directory));
+    if (error != ERROR_NONE) {
+        return error;
+    }
+    int written = std::snprintf(out_path, out_path_size, "%s/%s", directory, child_path);
+    if (written < 0 || (size_t)written >= out_path_size) {
+        return ERROR_BUFFER_OVERFLOW;
+    }
+    return ERROR_NONE;
+}
+
+} // extern "C"