chore: Support listing smart contracts

This adds support for listing smart contracts across the entire
CDP account.

We will eventually add support for listing these by network as
well

lib/coinbase/smart_contract.rb

@@ -197,6 +197,16 @@ def read(
         convert_solidity_value(response)
       end
 
+      def list
+        Coinbase::Pagination.enumerate(
+          lambda { |page|
+            smart_contracts_api.list_smart_contracts(page: page)
+          }
+        ) do |smart_contract|
+          new(smart_contract)
+        end
+      end
+
       # Normalizes an ABI from a String or Array of Hashes to an Array of Hashes.
       # @param abi [String, Array] The ABI to normalize
       # @return [Array<Hash>] The normalized ABI

spec/unit/coinbase/smart_contract_spec.rb

@@ -199,6 +199,21 @@
     end
   end
 
+  describe '.list' do
+    subject(:enumerator) { described_class.list }
+
+    let(:api) { smart_contracts_api }
+    let(:fetch_params) { ->(page) { [{ page: page }] } }
+    let(:resource_list_klass) { Coinbase::Client::SmartContractList }
+    let(:item_klass) { described_class }
+    let(:item_initialize_args) { nil }
+    let(:create_model) do
+      ->(id) { Coinbase::Client::SmartContract.new(smart_contract_id: id, network_id: :base_sepolia) }
+    end
+
+    it_behaves_like 'it is a paginated enumerator', :smart_contracts
+  end
+
   describe '.register' do
     subject(:smart_contract) do
       described_class.register(