Implement Holder HTLC claim chunking for 0FC channels

Otherwise, we could hit the max 10_000vB size limit on V3 transactions
(BIP 431 rule 4).

Also introduce a `max_tx_weight` parameter to `select_confirmed_utxos`.
This constraint makes sure anchor and HTLC transactions in 0FC channels
satisfy the `TRUC_MAX_WEIGHT` and the `TRUC_CHILD_MAX_WEIGHT`
maximums.

Expand the coin-selection algorithm provided for any `T: WalletSource`
to satisfy this new constraint.

Author: tankyleo

lightning/src/events/bump_transaction/mod.rs

@@ -390,7 +390,7 @@ pub trait CoinSelectionSource {
 	/// [`ChannelMonitor::rebroadcast_pending_claims`]: crate::chain::channelmonitor::ChannelMonitor::rebroadcast_pending_claims
 	fn select_confirmed_utxos<'a>(
 		&'a self, claim_id: ClaimId, must_spend: Vec<Input>, must_pay_to: &'a [TxOut],
-		target_feerate_sat_per_1000_weight: u32,
+		target_feerate_sat_per_1000_weight: u32, max_tx_weight: u64,
 	) -> AsyncResult<'a, CoinSelection, ()>;
 	/// Signs and provides the full witness for all inputs within the transaction known to the
 	/// trait (i.e., any provided via [`CoinSelectionSource::select_confirmed_utxos`]).
@@ -607,7 +607,7 @@ where
 {
 	fn select_confirmed_utxos<'a>(
 		&'a self, claim_id: ClaimId, must_spend: Vec<Input>, must_pay_to: &'a [TxOut],
-		target_feerate_sat_per_1000_weight: u32,
+		target_feerate_sat_per_1000_weight: u32, max_tx_weight: u64,
 	) -> AsyncResult<'a, CoinSelection, ()> {
 		Box::pin(async move {
 			let utxos = self.source.list_confirmed_utxos().await?;

lightning/src/events/bump_transaction/sync.rs

@@ -170,7 +170,7 @@ where
 {
 	fn select_confirmed_utxos<'a>(
 		&'a self, claim_id: ClaimId, must_spend: Vec<Input>, must_pay_to: &'a [TxOut],
-		target_feerate_sat_per_1000_weight: u32,
+		target_feerate_sat_per_1000_weight: u32, max_tx_weight: u64,
 	) -> AsyncResult<'a, CoinSelection, ()> {
 		let coins = self.0.select_confirmed_utxos(
 			claim_id,