Support beacon chain (#436)

foundation/src/main/kotlin/io/emeraldpay/dshackle/BlockchainType.kt

@@ -1,5 +1,18 @@
 package io.emeraldpay.dshackle
 
-enum class BlockchainType {
-    UNKNOWN, BITCOIN, ETHEREUM, STARKNET, POLKADOT, SOLANA, NEAR;
+enum class BlockchainType(
+    val apiType: ApiType,
+) {
+    UNKNOWN(ApiType.JSON_RPC),
+    BITCOIN(ApiType.JSON_RPC),
+    ETHEREUM(ApiType.JSON_RPC),
+    STARKNET(ApiType.JSON_RPC),
+    POLKADOT(ApiType.JSON_RPC),
+    SOLANA(ApiType.JSON_RPC),
+    NEAR(ApiType.JSON_RPC),
+    ETHEREUM_BEACON_CHAIN(ApiType.REST);
+}
+
+enum class ApiType {
+    JSON_RPC, REST;
 }