Make tree_data static functions available in api

 We need certain functions to be exposed via a public API to make it
 possible to use in other languages such as Rust.

 lyd_parent, lyd_child, and lyd_get_value are defined as static inline
 and is difficult for tools to wrap them.

Author: IrfanMohammad

src/tree_data.c

@@ -3056,3 +3056,21 @@ lyd_find_target(const struct ly_path *path, const struct lyd_node *tree, struct
     }
     return LY_SUCCESS;
 }
+
+LIBYANG_API_DEF struct lyd_node *
+lyd_get_parent(const struct lyd_node *node)
+{
+    return lyd_parent(node);
+}
+
+LIBYANG_API_DEF struct lyd_node *
+lyd_get_child(const struct lyd_node *node)
+{
+    return lyd_child(node);
+}
+
+LIBYANG_API_DEF const char *
+lyd_node_get_value(const struct lyd_node *node)
+{
+    return lyd_get_value(node);
+}

src/tree_data.h

@@ -1014,6 +1014,9 @@ lyd_parent(const struct lyd_node *node)
     return &node->parent->node;
 }
 
+LIBYANG_API_DECL struct lyd_node *
+lyd_get_parent(const struct lyd_node *node);
+
 /**
  * @brief Get the child pointer of a generic data node.
  *
@@ -1048,6 +1051,9 @@ lyd_child(const struct lyd_node *node)
     }
 }
 
+LIBYANG_API_DECL struct lyd_node *
+lyd_get_child(const struct lyd_node *node);
+
 /**
  * @brief Get the child pointer of a generic data node but skip its keys in case it is ::LYS_LIST.
  *
@@ -1159,6 +1165,9 @@ lyd_get_value(const struct lyd_node *node)
     return NULL;
 }
 
+LIBYANG_API_DECL const char *
+lyd_node_get_value(const struct lyd_node *node);
+
 /**
  * @brief Get anydata string value.
  *