Add ComputeBudgetProgram to be able to set transaction priority fees

Sources/SolanaSwift/Programs/ComputeBudgetProgram.swift

@@ -0,0 +1,35 @@
+import Foundation
+
+public enum ComputeBudgetProgram: SolanaBasicProgram {
+    // MARK: - Nested type
+
+    public enum Index {
+        static let requestUnits: UInt8 = 0
+        static let requestHeapFrame: UInt8 = 1
+        static let setComputeUnitLimit: UInt8 = 2
+        static let setComputeUnitPrice: UInt8 = 3
+    }
+
+    /// The public id of the program
+    public static var id: PublicKey {
+        "ComputeBudget111111111111111111111111111111"
+    }
+
+    /// Create SetComputeUnitPrice instruction
+    public static func createSetComputeUnitPriceInstruction(microLamports: UInt64) throws -> TransactionInstruction {
+        TransactionInstruction(
+            keys: [],
+            programId: id,
+            data: [Index.setComputeUnitPrice, microLamports]
+        )
+    }
+
+    /// Create SetComputeUnitLimit instruction
+    public static func createSetComputeUnitLimitInstruction(limit: UInt32) throws -> TransactionInstruction {
+        TransactionInstruction(
+            keys: [],
+            programId: id,
+            data: [Index.setComputeUnitLimit, limit]
+        )
+    }
+}