snippets for sweeping funds on channel closes. (#110)

* Bump breez-sdk snippet dependency to 0.2.12

* Bump the Swift snippet macos version to v13

* Bump breez-sdk snippet dependency to 0.2.14

* swiftformat

* redeem_onchain_funds example

* Document swapinfo fields

* example on how to use local breez-sdk package

* fix dart example

* yarn lint

* remove swapinfo docs

* dart fixup

---------

Co-authored-by: ok300 <106775972+ok300@users.noreply.github.com>

snippets/dart_snippets/lib/closed_channel.dart

@@ -0,0 +1,26 @@
+import 'package:breez_sdk/breez_sdk.dart';
+import 'package:breez_sdk/bridge_generated.dart';
+
+Future<PrepareRedeemOnchainFundsResponse> prepareRedeemOnchainFunds(
+    {required int satPerVbyte}) async {
+  // ANCHOR: prepare-redeem-onchain-funds
+  PrepareRedeemOnchainFundsRequest req = PrepareRedeemOnchainFundsRequest(
+    toAddress: "bc1..",
+    satPerVbyte: satPerVbyte,
+  );
+  final resp = await BreezSDK().prepareRedeemOnchainFunds(req: req);
+  // ANCHOR_END: prepare-redeem-onchain-funds
+  return resp;
+}
+
+Future<RedeemOnchainFundsResponse> redeemOnchainFunds(
+    {required int satPerVbyte, required String toAddress}) async {
+  // ANCHOR: redeem-onchain-funds
+  RedeemOnchainFundsRequest req = RedeemOnchainFundsRequest(
+    toAddress: "bc1..",
+    satPerVbyte: satPerVbyte,
+  );
+  final resp = await BreezSDK().redeemOnchainFunds(req: req);
+  // ANCHOR_END: redeem-onchain-funds
+  return resp;
+}

snippets/dart_snippets/lib/send_spontaneous_payment.dart

@@ -21,7 +21,7 @@ Future<SendPaymentResponse> sendSpontaneousPaymentWithTlvs({
   // ANCHOR: send-spontaneous-payment-with-tlvs
   List<TlvEntry> extraTlvs = [
     TlvEntry(
-      fieldNumber: 34349334, 
+      fieldNumber: 34349334,
       value: utf8.encode("Hello world!"),
     )
   ];

snippets/dart_snippets/pubspec.lock

@@ -55,7 +55,7 @@ packages:
       path: "packages/breez-sdk-flutter"
       relative: true
     source: path
-    version: "0.2.10"
+    version: "0.2.15"
   build:
     dependency: transitive
     description: