feat: (v1.0.3) ESP32 support

[JeremyTubongbanua]

- What I did

• Updated uuid4 to v1.0.3 in CMakeLists.txt
• Added ESP32 support using preprocessor functions in uuid4.c
• Added ESP32 support in CMakeLists.txt

- How to verify it

Here's proof of UUID4 generation on ESP32

#include <stdio.h>
#include <string.h>
#include <atclient/atclient.h>
#include <atchops/uuid.h>

void app_main(void) {
    printf("Hello, World!\n");

    atchops_uuid_init();

    char my_str[90];
    memset(my_str, 0, sizeof(char) * 90);

    atchops_uuid_generate(my_str, 90);

    printf("UUID: %s\n", my_str);
}

- Description for the changelog
feat: ESP32 support

[JeremyTubongbanua]

Upon approval, we should:

1. Make a v1.0.3 release
2. Update at_c/packages/atchops dependency to use the new release

[JeremyTubongbanua]

Putting back to draft. I want to first add idf_component.yml

[JeremyTubongbanua]

Ready for review

[realvarx]

LGTM