ui: add AlbyButton

This will be used for alby's nostr wallet connect implementation

damus/Util/Extensions/FillAndStroke.swift

@@ -0,0 +1,25 @@
+//
+//  FillAndStroke.swift
+//  damus
+//
+//  Created by William Casarin on 2023-05-09.
+//
+
+import Foundation
+import SwiftUI
+
+extension Shape {
+    func fill<Fill: ShapeStyle, Stroke: ShapeStyle>(_ fillStyle: Fill, strokeBorder strokeStyle: Stroke, lineWidth: Double = 1) -> some View {
+        self
+            .stroke(strokeStyle, lineWidth: lineWidth)
+            .background(self.fill(fillStyle))
+    }
+}
+
+extension InsettableShape {
+    func fill<Fill: ShapeStyle, Stroke: ShapeStyle>(_ fillStyle: Fill, strokeBorder strokeStyle: Stroke, lineWidth: Double = 1) -> some View {
+        self
+            .strokeBorder(strokeStyle, lineWidth: lineWidth)
+            .background(self.fill(fillStyle))
+    }
+}

damus/Views/Buttons/AlbyButton.swift

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+//
+//  AlbyButton.swift
+//  damus
+//
+//  Created by William Casarin on 2023-05-09.
+//
+
+import SwiftUI
+
+struct AlbyButton: View {
+    let action: () -> ()
+    
+    @Environment(\.colorScheme) var colorScheme
+    
+    init(action: @escaping () -> ()) {
+        self.action = action
+    }
+    
+    var body: some View {
+        Button(action: {
+            action()
+        }) {
+            HStack {
+                Image("alby")
+                
+                Text("Connect to Alby")
+            }
+            .offset(x: -25)
+            .frame(minWidth: 300, maxWidth: .infinity, minHeight: 50, maxHeight: 50, alignment: .center)
+            .foregroundColor(DamusColors.black)
+            .background {
+                RoundedRectangle(cornerRadius: 24)
+                    .fill(AlbyGradient, strokeBorder: colorScheme == .light ? DamusColors.black : DamusColors.white, lineWidth: 2)
+            }
+            .padding(EdgeInsets(top: 10, leading: 50, bottom: 25, trailing: 50))
+        }
+    }
+}
+
+struct AlbyButton_Previews: PreviewProvider {
+    static var previews: some View {
+        AlbyButton(action: {
+            print("alby button")
+        })
+    }
+}