Lightspark

- Add idempotency where useful!
- Add optional `idempotency_key` to `pay_invoice` and `request_withdrawal`.
- Add `idempotency_key` to `OutgoingPayment` and `Withdrawal` objects.
- Add new `outgoing_payment_for_idempotency_key` query.

- Minor type fix in the `outgoing_payments_for_payment_hash` query.

- Add `fail_htlcs` function to cancel pending htlcs (for example for HODL invoices).
- Add `outgoing_payments_for_payment_hash` to get all outgoing payments for a specific hash.
- Compress requests and support zstd.

- Use a 64-bit nonce for signed requests to avoid conflicts.
- Add `is_internal_payment` fields to payment objects.
- Add `multisig_wallet_address_validation_parameters` to support validating node wallet addresses used for deposits.
- Add `incoming_payments_for_invoice` to get all incoming payments for an invoice.

- Ensure that the README and LICENSE are included in the pypi package.
- Make get_decoded_payment_request return an InvoiceData type.

- Add is_uma flag to payment objects. Note that this is only accurate for payments/invoices created with create_uma_invoice or pay_uma_invoice.
- Tweak the ChannelSnapshot object to make it more expressive.
- Include type info in the package release.