Remove object schema parsing in CommandDefinition

The only thing we now care about in CommandDefinition is the
"minimalRole" field. Everything else is a black-box which we just
forward to the server without any semantic parsing.

Also completely removed command visibility support since it no
longer applies to trait/component model.

BUG: 25841230
Change-Id: Ie8fff57ffada289caa7876c2a53150bb116fd65b
Reviewed-on: https://weave-review.googlesource.com/1617
Reviewed-by: Vitaly Buka <vitalybuka@google.com>

src/commands/command_queue_unittest.cc

diff --git a/src/commands/command_queue_unittest.cc b/src/commands/command_queue_unittest.cc
index 5060071..a9e953e 100644
--- a/src/commands/command_queue_unittest.cc
+++ b/src/commands/command_queue_unittest.cc
@@ -20,11 +20,15 @@
 
 class CommandQueueTest : public testing::Test {
  public:
+  CommandQueueTest() {
+    command_definition_ = CommandDefinition::FromJson({}, nullptr);
+  }
+
   std::unique_ptr<CommandInstance> CreateDummyCommandInstance(
       const std::string& name,
       const std::string& id) {
     std::unique_ptr<CommandInstance> cmd{new CommandInstance{
-        name, Command::Origin::kLocal, &command_definition_, {}}};
+        name, Command::Origin::kLocal, command_definition_.get(), {}}};
     cmd->SetID(id);
     return cmd;
   }
@@ -39,8 +43,7 @@
   CommandQueue queue_;
 
  private:
-  CommandDefinition command_definition_{
-      ObjectSchema::Create(), ObjectSchema::Create(), ObjectSchema::Create()};
+  std::unique_ptr<CommandDefinition> command_definition_;
 };
 
 // Keeps track of commands being added to and removed from the queue_.