list_vtxos needs to support pagination

[bonomat]

The GRPC endpoint has support for pagination already but our API doesn't :

rust-sdk/ark-grpc/src/client.rs

Lines 112 to 135 in 58b07ee

	pub async fn list_vtxos(
	&self,
	request: GetVtxosRequest,
	) -> Result<Vec<VirtualTxOutPoint>, Error> {
	if request.reference().is_empty() {
	return Ok(Vec::new());
	}
	let mut client = self.indexer_client()?;
	let response = client
	.get_vtxos(generated::ark::v1::GetVtxosRequest::from(request))
	.await
	.map_err(Error::request)?;
	let vtxos = response
	.get_ref()
	.vtxos
	.iter()
	.map(VirtualTxOutPoint::try_from)
	.collect::<Result<Vec<_>, _>>()?;
	Ok(vtxos)
	}

rust-sdk/ark-grpc/src/client.rs

Line 1055 in 58b07ee

page: None,