Rename SpotPrice* to Price*

SatsPrice/Network/PriceFetcherDelegator.swift

@@ -0,0 +1,29 @@
+//
+//  PriceFetcherDelegator.swift
+//  SatsPrice
+//
+//  Created by Terry Yiu on 2/20/24.
+//
+
+import Foundation
+import BigDecimal
+
+class PriceFetcherDelegator: PriceFetcher {
+    private let coinbasePriceFetcher = CoinbasePriceFetcher()
+    private let coinGeckoPriceFetcher = CoinGeckoPriceFetcher()
+
+    var priceSource: PriceSource = .coinbase
+
+    private var delegate: PriceFetcher {
+        switch priceSource {
+        case .coinbase:
+            coinbasePriceFetcher
+        case .coingecko:
+            coinGeckoPriceFetcher
+        }
+    }
+
+    func btcToUsd() async throws -> BigDecimal? {
+        return try await delegate.btcToUsd()
+    }
+}