Make the point code unique in the db

[NubeDev]

Make it so the user can't add the same name twice

This should be the same for the networks and most other things like equipment, things, networks

[zero88]

code is already unique or combine unique depends on entity:

• edge: code is unique
• network: code + edge + protocol is unique. Due to edge is only one in each rubix, so code + protocol can understand as unique. In which protocol is one of BACNet, Modbus, etc
• device: code + DEVICE_TYPE is unique. DeviceType is one of machine or GATEWAY or Equipment, etc
• point: code + edge + network is unique. Due to edge is only one in each rubix, so code + network can understand as unique