Handle expand query params as comma separated list

[fern-support]

I created a custom test with the following code, which generated a successful response:

import os
import pytest
from merge import Merge
from merge.resources.accounting.resources.invoices.types import (
    InvoicesListRequestExpand,
    InvoicesListRequestType,
    InvoicesListRequestStatus,
)


# Get started with writing tests with pytest at https://docs.pytest.org
@pytest.mark.skip(reason="Unimplemented")
def test_client() -> None:
    assert True


def test_list_invoices_with_expand():
    client = Merge(
        api_key=api_key,
        account_token=account_token,
    )
    expand = [
        InvoicesListRequestExpand.EMPLOYEE,
        InvoicesListRequestExpand.ACCOUNTING_PERIOD,
        InvoicesListRequestExpand.APPLIED_CREDIT_NOTES,
        InvoicesListRequestExpand.CONTACT,
        InvoicesListRequestExpand.PAYMENT_TERM,
    ]
    result = client.accounting.invoices.list(
        expand=expand,
        include_remote_data=True,
        page_size=100,
        type=InvoicesListRequestType.ACCOUNTS_RECEIVABLE,
        status=InvoicesListRequestStatus.OPEN,
    )
    for invoice in result.results:
        print(f"Invoice ID: {invoice.id}")

[semgrep-app]

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