feat: add block list serializer

app/controllers/api/v1/blocks_controller.rb

@@ -13,7 +13,7 @@ def index
           options = FastJsonapi::PaginationMetaGenerator.new(request: request, records: blocks, page: @page, page_size: @page_size).call
         end
 
-        render json: BlockSerializer.new(blocks, options)
+        render json: BlockListSerializer.new(blocks, options)
       end
 
       def show

app/serializers/block_list_serializer.rb

@@ -0,0 +1,18 @@
+class BlockListSerializer
+  include FastJsonapi::ObjectSerializer
+
+  attributes :miner_hash
+
+  attribute :number do |object|
+    object.number.to_s
+  end
+  attribute :timestamp do |object|
+    object.timestamp.to_s
+  end
+  attribute :reward do |object|
+    object.reward.to_s
+  end
+  attribute :transactions_count do |object|
+    object.ckb_transactions_count.to_s
+  end
+end