[esp32] Added CHIP esp32 shell for testing purposes (#6253)

* Added gn option for linking against shell library
* Added chip-shell project for esp32

config/esp32/components/chip/Kconfig

diff --git a/config/esp32/components/chip/Kconfig b/config/esp32/components/chip/Kconfig
index 98811d3..c4c92da 100644
--- a/config/esp32/components/chip/Kconfig
+++ b/config/esp32/components/chip/Kconfig
@@ -91,6 +91,12 @@
                 The CHIP library is shipped with a minimal mDNS implementation,
                 enable this config to use it rather than the mDNS library in IDF.
 
+        config ENABLE_CHIP_SHELL
+            bool "Use the CHIP shell library"
+            default n
+            help
+                Link the application against CHIP interactive shell.
+
         # TODO: add log level selection
 
     endmenu # "General Options"