Clean up constructor interface

- replace string type constructor argument with "const string&"
- replace vector type constructor argument with "const vector<T>&"
- add rvalue reference constructor for TosaSerializationOperator and TosaSerializationBasicBlock
- add SetData() for TosaSerializationTensor, so tensor can be constructed first and data can be linked later

Signed-off-by: Kevin Cheng <kevin.cheng@arm.com>
Change-Id: I7c739df54c37b7ba69ebb6e5af118f660c7c0623