Add zCash and Ethereum unique data dirs to chain_providers.cfg

[seriouscatsoserious]

Presently the location of Zcash (.zcash-drivechain on Linux and ZcashDrivechain on macOS) and Ethereum (.ethereum on both) are hardcoded in a function that deletes them specifically during a reset everything call. They should be added to chain_providers.cfg so that they can be called using chain_providers for clarity and robustness.