Enable unstable API and all examples build for rpi_pico (#824)

Author: sashacmc

examples/rpi_pico/CMakeLists.txt

@@ -84,6 +84,7 @@ endif()
 
 declare_cache_var(Z_FEATURE_LINK_SERIAL 1 STRING "Serial support")
 if(ZENOH_USB_UART)
+  declare_cache_var(Z_FEATURE_UNSTABLE_API 1 STRING "Enable unstable API")
   declare_cache_var(Z_FEATURE_LINK_SERIAL_USB 1 STRING "Serial USB support")
 else()
   declare_cache_var(Z_FEATURE_LINK_SERIAL_USB 0 STRING "Serial USB support")
@@ -150,14 +151,14 @@ function(add_example name)
   pico_add_extra_outputs(${name})
 endfunction()
 
-#add_example(z_get)
+add_example(z_get)
 add_example(z_pub)
-#add_example(z_pub_st)
-#add_example(z_pub_thr)
-#add_example(z_pull)
-#add_example(z_put)
-#add_example(z_queryable)
-#add_example(z_scout)
-#add_example(z_sub)
-#add_example(z_sub_st)
-#add_example(z_sub_thr)
+add_example(z_pub_st)
+add_example(z_pub_thr)
+add_example(z_pull)
+add_example(z_put)
+add_example(z_queryable)
+add_example(z_scout)
+add_example(z_sub)
+add_example(z_sub_st)
+add_example(z_sub_thr)