Use explicit Send/Sync rather than MaybeSend/MaybeSync

We use `MaybeSend` + `MaybeSync` in rust to only enable
`Send`+`Sync` bounds if built with `std`, but there's no reason to
bother with this in bindings, even for `no_std` builds. As the
bindings generator doesn't currently have logic to identify traits
like these as "synonyms" for `Send`+`Sync`, we just use
`Send`+`Sync` explicitly.

Author: TheBlueMatt

lightning/src/events/bump_transaction/sync.rs

@@ -17,7 +17,7 @@ use crate::chain::chaininterface::BroadcasterInterface;
 use crate::chain::ClaimId;
 use crate::prelude::*;
 use crate::sign::SignerProvider;
-use crate::util::async_poll::{dummy_waker, AsyncResult, MaybeSend, MaybeSync};
+use crate::util::async_poll::{dummy_waker, AsyncResult};
 use crate::util::logger::Logger;
 
 use bitcoin::{Psbt, ScriptBuf, Transaction, TxOut};
@@ -93,30 +93,30 @@ where
 ///
 /// For an asynchronous version of this wrapper, see [`Wallet`].
 // Note that updates to documentation on this struct should be copied to the asynchronous version.
-pub struct WalletSync<W: Deref + MaybeSync + MaybeSend, L: Deref + MaybeSync + MaybeSend>
+pub struct WalletSync<W: Deref + Sync + Send, L: Deref + Sync + Send>
 where
-	W::Target: WalletSourceSync + MaybeSend,
-	L::Target: Logger + MaybeSend,
+	W::Target: WalletSourceSync + Send,
+	L::Target: Logger + Send,
 {
 	wallet: Wallet<WalletSourceSyncWrapper<W>, L>,
 }
 
-impl<W: Deref + MaybeSync + MaybeSend, L: Deref + MaybeSync + MaybeSend> WalletSync<W, L>
+impl<W: Deref + Sync + Send, L: Deref + Sync + Send> WalletSync<W, L>
 where
-	W::Target: WalletSourceSync + MaybeSend,
-	L::Target: Logger + MaybeSend,
+	W::Target: WalletSourceSync + Send,
+	L::Target: Logger + Send,
 {
 	/// Constructs a new [`WalletSync`] instance.
 	pub fn new(source: W, logger: L) -> Self {
 		Self { wallet: Wallet::new(WalletSourceSyncWrapper(source), logger) }
 	}
 }
 
-impl<W: Deref + MaybeSync + MaybeSend, L: Deref + MaybeSync + MaybeSend> CoinSelectionSourceSync
+impl<W: Deref + Sync + Send, L: Deref + Sync + Send> CoinSelectionSourceSync
 	for WalletSync<W, L>
 where
-	W::Target: WalletSourceSync + MaybeSend + MaybeSync,
-	L::Target: Logger + MaybeSend + MaybeSync,
+	W::Target: WalletSourceSync + Send + Sync,
+	L::Target: Logger + Send + Sync,
 {
 	fn select_confirmed_utxos(
 		&self, claim_id: ClaimId, must_spend: Vec<Input>, must_pay_to: &[TxOut],