feat: Alonzo genesis config (#722)

Fixes #717

ledger/alonzo/genesis.go

@@ -0,0 +1,26 @@
+// Copyright 2024 Blink Labs Software
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package alonzo
+
+type AlonzoGenesis struct {
+	LovelacePerUtxoWord  uint64 `json:"lovelacePerUTxOWord"`
+	MaxValueSize         int
+	CollateralPercentage int
+	MaxCollateralInputs  int
+	ExecutionPrices      map[string]map[string]int
+	MaxTxExUnits         map[string]int
+	MaxBlockExUnits      map[string]int
+	CostModels           map[string]map[string]int
+}