server: add built-in tools backend support (#20898)

* wip: server_tools

* refactor

* displayName -> display_name

* snake_case everywhere

* rm redundant field

* change arg to --tools all

* add readme mention

* llama-gen-docs

tools/server/CMakeLists.txt

@@ -13,6 +13,8 @@ add_library(${TARGET} STATIC
     server-common.h
     server-context.cpp
     server-context.h
+    server-tools.cpp
+    server-tools.h
 )
 
 if (BUILD_SHARED_LIBS)