Add bind-tools option to ease the server/tools package split

--- meson_options.txt.orig	2025-07-19 11:32:37 UTC
+++ meson_options.txt
@@ -188,3 +188,5 @@ option(
     value: 'disabled',
     description: 'enable the memory leak detection in external libraries (libxml2, libuv, OpenSSL)',
 )
+
+option('bind-tools', type: 'feature', value: 'disabled', description: 'build tools only')
