[bitwarden] ability to fetch all fields from an item

Sometimes a projects has a lot of secrets (more than 10). And its
cumbersome to write $(kama secrets fetch ...) with a lot of field names.

I want to be able to just fetch all the fields from a given item and then
just use these with $(kamal extract NAME)

lib/kamal/secrets/adapters/bitwarden.rb

@@ -29,6 +29,7 @@ def fetch_secrets(secrets, account:, session:)
           item_json = JSON.parse(item_json)
 
           if fields.any?
+            fields = item_json["fields"].pluck("name") if fields == [ "__ALL__" ]
             fields.each do |field|
               item_field = item_json["fields"].find { |f| f["name"] == field }
               raise RuntimeError, "Could not find field #{field} in item #{item} in Bitwarden" unless item_field

test/secrets/bitwarden_adapter_test.rb

@@ -38,6 +38,20 @@ class BitwardenAdapterTest < SecretAdapterTestCase
     assert_equal expected_json, json
   end
 
+  test "fetch all with from" do
+    stub_unlocked
+    stub_ticks.with("bw sync").returns("")
+    stub_myitem
+
+    json = JSON.parse(shellunescape(run_command("fetch", "--from", "myitem", "__ALL__")))
+
+    expected_json = {
+      "myitem/field1"=>"secret1", "myitem/field2"=>"blam", "myitem/field3"=>"fewgrwjgk", "myitem/field4"=>"auto"
+    }
+
+    assert_equal expected_json, json
+  end
+
   test "fetch with multiple items" do
     stub_unlocked
 
@@ -237,7 +251,8 @@ def stub_myitem
             "fields":[
               {"name":"field1","value":"secret1","type":1,"linkedId":null},
               {"name":"field2","value":"blam","type":1,"linkedId":null},
-              {"name":"field3","value":"fewgrwjgk","type":1,"linkedId":null}
+              {"name":"field3","value":"fewgrwjgk","type":1,"linkedId":null},
+              {"name":"field4","value":"auto","type":1,"linkedId":null}
             ],
             "login":{"fido2Credentials":[],"uris":[],"username":null,"password":null,"totp":null,"passwordRevisionDate":null},"collectionIds":[]
           }