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/swift/BreezSDKExamples/Sources/ClosedChannel.swift

@@ -0,0 +1,27 @@
+//
+//  ClosedChannel.swift
+//
+//
+//  Created by ruben on 12/12/2023.
+//
+import Foundation
+
+import BreezSDK
+
+func prepareRedeemOnchainFunds(sdk: BlockingBreezServices, feeRate: UInt32) -> PrepareRedeemOnchainFundsResponse? {
+    // ANCHOR: prepare-redeem-onchain-funds
+    let satPerVbyte = feeRate
+    let req = PrepareRedeemOnchainFundsRequest(toAddress: "bc1..", satPerVbyte: satPerVbyte)
+    let prepareRedeemOnchainFundsResponse = try? sdk.prepareRedeemOnchainFunds(req: req)
+    // ANCHOR_END: prepare-redeem-onchain-funds
+    return prepareRedeemOnchainFundsResponse
+}
+
+func redeemOnchainFunds(sdk: BlockingBreezServices, toAddress _: String, feeRate: UInt32) -> RedeemOnchainFundsResponse? {
+    // ANCHOR: redeem-onchain-funds
+    let satPerVbyte = feeRate
+    let req = RedeemOnchainFundsRequest(toAddress: "bc1..", satPerVbyte: satPerVbyte)
+    let redeemOnchainFundsResponse = try? sdk.redeemOnchainFunds(req: req)
+    // ANCHOR_END: redeem-onchain-funds
+    return redeemOnchainFundsResponse
+}