AP_HAL_ESP32: add targets to measure static memory sizes

[srmainwaring]

Add targets from ${IDF_PATH}/tools/cmake/project.cmake to measure the allocation of static memory.

These targets: size, size-components, size-files, may be used in the board build directory. For example if board=esp32s3empty:

$ cd ./build/esp32s3empty/esp-idf_build
$ ninja -v -v size

Total sizes:
Used stat D/IRAM:  243738 bytes (  98022 remain, 71.3% used)
      .data size:   14796 bytes
      .bss  size:  130256 bytes
      .text size:   97659 bytes
   .vectors size:    1027 bytes
Used Flash size : 1122994 bytes
           .text:  925938 bytes
         .rodata:  196800 bytes
Total image size: 1236476 bytes (.bin may be padded larger)

[tpwrules]

Does what it says on the tin. Uploading still works.