feat: start work on uuid support

[iamwacko]

UUID was implemented as a string, which meant it would not work with the UUID type in databases. #270

[iamwacko]

If anyone wants this merged they have to figure out how to make pretty printing the OwnedSerializable in the test_compile_and_generate test in the core crate not give an error along the lines of key must be a string.

[ratskates]

Any chance of getting this merged in ? It's a read blocker for me.

[JRileyH]

What's the realistic timeline of getting this merged? I cannot use synth until UUIDs are supported in postgres.

Also thanks for taking his on @iamwacko :) Looks like more than a few people will be really happy to see this fixed.

[iamwacko]

I don't really have a schedule. It should be working, and rust-gdb even shows UUID's in memory. The only blocker is the key must be a string error, which I have spent hours trying to fix. If anyone could figure out how to deal with it I could put out a new release that day.

[njohnson-ml]

@iamwacko do you get any more info on the failure when you set RUST_BACKTRACE=1?

[murugesanp92]

@iamwacko any progress on this?

[F3ss]

Perhaps this will help someone as a temporary solution: generate data in a json file synth generate ./my-table --size 50000 > .tmp/my-table.json, convert it to CSV in a convenient way for you and save it in the database.

My python script for convert to CSV: ```
import json
import csv
from datetime import datetime

def json_to_csv(json_file, csv_file):
try:
with open(json_file, 'r', encoding='utf-8') as f:
data = json.load(f)

    if 'attribute' not in data:
        raise KeyError("Key 'attribute' not found in JSON file")

    with open(csv_file, 'w', newline='', encoding='utf-8') as csvfile:
        fieldnames = ['attribute_id', 'created_at', 'id', 'name', 'value']
        writer = csv.DictWriter(csvfile, fieldnames=fieldnames)

        writer.writeheader()

        for item in data['attribute']:
            attribute_id = item.get('attribute_id', '')
            created_at = item.get('created_at', '')
            try:
                created_at = datetime.strptime(created_at, '%Y-%m-%d %H:%M:%S.%f')
            except ValueError:
                pass

            row = {
                'attribute_id': attribute_id,
                'created_at': created_at,
                'id': item.get('id', ''),
                'name': item.get('name', ''),
                'value': json.dumps(item.get('value', {}))
            }

            writer.writerow(row)

    print(f"Data successfully written to {csv_file}")

except Exception as e:
    print(f"An error occurred: {e}")

json_file_path = '.tmp/my-table.json'
csv_file_path = '.tmp/my-table.csv'

json_to_csv(json_file_path, csv_file_path)