fix(sharder): treat conditional as shards

Since conditionals depend on classical bits in their condition,
we should create shards for each of them, instead of completely
ignoring any dependency that may occur on those classical bits.
Fixes: #150

A side effect:
	We were previously emitting a Skip mop (introduced in #138)
	for conditional global phase operations, but now they
	correctly get filtered out by `_is_command_global_phase`

pytket/phir/sharding/sharder.py

@@ -273,7 +273,7 @@ def should_op_create_shard(op: Op) -> bool:
         """
         return (
             op.type in SHARD_TRIGGER_OP_TYPES
-            or (isinstance(op, Conditional) and op.op.type in SHARD_TRIGGER_OP_TYPES)
+            or (isinstance(op, Conditional))
             or (op.is_gate() and op.n_qubits > 1)
         )