refactor(connector): add amount conversion framework to payone

[KiranKBR]

Type of Change

• Refactoring

Description

This PR adds amount conversion framework to payone

Note: payone works in MinorUnit

Additional Changes

• This PR modifies the API contract
• This PR modifies the database schema
• This PR modifies application configuration/environment variables

Motivation and Context

How did you test it?

Flows to test in payone

-Payout

curl --location 'http://127.0.0.1:8080/payouts/create' \
--header 'Content-Type: application/json' \
--header 'api-key: dev_vwnvqSv9eOBQ0krvZ9g0um2HCsD3KgwJzJME1THgqgo0d8qNDHerOwVBrxEGRg6F' \
--data-raw '{
    "amount": 100,
    "currency": "EUR",
    "customer_id": "payout_customer",
    "email": "[email protected]",
    "name": "John Doe",
    "phone": "999999999",
    "phone_country_code": "+65",
    "description": "Its my first payout request",
    "payout_type": "card",
    "payout_method_data": {
        "card": {
            "card_number": "4301111100000200",
            "expiry_month": "05",
            "expiry_year": "30",
            "card_holder_name": "John Smith"
        }
    },
    "billing": {
        "address": {
            "line1": "1467",
            "line2": "Harrison Street",
            "line3": "Harrison Street",
            "city": "San Fransico",
            "state": "NY",
            "zip": "94122",
            "country": "US",
            "first_name": "John",
            "last_name": "Doe"
        },
        "phone": {
            "number": "8056594427",
            "country_code": "+91"
        }
    },
    "entity_type": "Individual",
    "recurring": false,
    "metadata": {
        "ref": "123"
    },
        "business_country": "US",
    "business_label": "default",
    
    
    
    
    "auto_fulfill": true,
    "confirm": true
}'

## Checklist

• I formatted the code cargo +nightly fmt --all
• I addressed lints thrown by cargo clippy
• I reviewed the submitted code
• I added unit tests for my changes where possible