Add set and get commands for ESP RainMaker console (MEGH-6740)

[Infishiv]

This PR adds two new console commands to ESP RainMaker:

 - `set`: Allows setting parameter values for devices
   Usage: set <device_name> <param_name> <value>
 
 - `get`: Allows getting parameter values from devices
   Usage: get <device_name> <param_name>
 
 These commands make it easier to interact with ESP RainMaker devices through the console interface.

[CLAassistant]

All committers have signed the CLA.

[Infishiv]

Removed duplicate string.h

[Copilot]

Pull Request Overview

Adds set and get console commands to allow users to modify and retrieve ESP RainMaker device parameters via the console interface.

• Implements set_handler and register_set for the set command
• Implements get_handler and register_get for the get command
• Updates register_commands to include the new commands and adds <stdlib.h> for conversions

Comments suppressed due to low confidence (4)

components/esp_rainmaker/src/console/esp_rmaker_commands.c:268

• [nitpick] The help string is generic. Consider including the usage pattern (e.g., Usage: set <device_name> <param_name> <value>) to guide users.

        .help = "Set command for ESP RainMaker device parameters",

components/esp_rainmaker/src/console/esp_rmaker_commands.c:333

• [nitpick] Include the usage syntax (e.g., Usage: get <device_name> <param_name>) in the help string for clarity.

        .help = "Get command for ESP RainMaker device parameters",

components/esp_rainmaker/src/console/esp_rmaker_commands.c:198

• Consider adding unit or integration tests for the new set command handler to validate parsing, type conversion, and error handling.

static int set_handler(int argc, char** argv)

components/esp_rainmaker/src/console/esp_rmaker_commands.c:264

• [nitpick] register_set is ambiguous and inconsistent with other register_*_command functions. Consider renaming to register_set_command for clarity and consistency.

static void register_set()