impl Clone on various public (mostly BOLT12) types

This is required for bindings as passing types from Rust to GC'd
languages can't map the concept of a type that has a lifetime of
the called function but instead needs to clone for safety.

lightning/src/ln/onion_payment.rs

@@ -26,7 +26,7 @@ use crate::prelude::*;
 use core::ops::Deref;
 
 /// Invalid inbound onion payment.
-#[derive(Debug)]
+#[derive(Clone, Debug, Hash, PartialEq, Eq)]
 pub struct InboundHTLCErr {
 	/// BOLT 4 error code.
 	pub err_code: u16,

lightning/src/offers/invoice.rs

@@ -503,6 +503,7 @@ for InvoiceBuilder<'a, DerivedSigningPubkey> {
 ///
 /// This is serialized as a TLV stream, which includes TLV records from the originating message. As
 /// such, it may include unknown, odd TLV records.
+#[derive(Clone)]
 pub struct UnsignedBolt12Invoice {
 	bytes: Vec<u8>,
 	contents: InvoiceContents,

lightning/src/offers/invoice_request.rs

@@ -487,6 +487,7 @@ for InvoiceRequestBuilder<'a, 'b, DerivedPayerId, secp256k1::All> {
 ///
 /// This is serialized as a TLV stream, which includes TLV records from the originating message. As
 /// such, it may include unknown, odd TLV records.
+#[derive(Clone)]
 pub struct UnsignedInvoiceRequest {
 	bytes: Vec<u8>,
 	contents: InvoiceRequestContents,

lightning/src/offers/offer.rs

@@ -165,6 +165,7 @@ pub struct OfferBuilder<'a, M: MetadataStrategy, T: secp256k1::Signing> {
 ///
 /// [module-level documentation]: self
 #[cfg(c_bindings)]
+#[derive(Clone)]
 pub struct OfferWithExplicitMetadataBuilder<'a> {
 	offer: OfferContents,
 	metadata_strategy: core::marker::PhantomData<ExplicitMetadata>,
@@ -177,6 +178,7 @@ pub struct OfferWithExplicitMetadataBuilder<'a> {
 ///
 /// [module-level documentation]: self
 #[cfg(c_bindings)]
+#[derive(Clone)]
 pub struct OfferWithDerivedMetadataBuilder<'a> {
 	offer: OfferContents,
 	metadata_strategy: core::marker::PhantomData<DerivedMetadata>,

lightning/src/offers/refund.rs

@@ -141,6 +141,7 @@ pub struct RefundBuilder<'a, T: secp256k1::Signing> {
 ///
 /// [module-level documentation]: self
 #[cfg(c_bindings)]
+#[derive(Clone)]
 pub struct RefundMaybeWithDerivedMetadataBuilder<'a> {
 	refund: RefundContents,
 	secp_ctx: Option<&'a Secp256k1<secp256k1::All>>,