Move development network files to OS temporary directory

[ericglau]

Currently the network files for Hardhat networks (if the hardhat_metadata RPC method is detected) is written to the OS temporary directory as described in https://docs.openzeppelin.com/upgrades-plugins/1.x/network-files#temporary-files

More generically, if a dev network is detected (e.g. through the web3_clientVersion RPC method), we should do something similar and use the OS temporary directory instead of the .openzeppelin folder.

By doing this, the remaining files in .openzeppelin would be files that are for live networks and should be included in version control.