v0.8.0

• minimum go version increased to 1.17 for project and gh-action
• support for bee-gateway-proxy
• kv_export
• delete reference bag fixed of fairOS side. (commented out as bee unpin seems to have some issue ethersphere/bee#2713)
• remove vendor directory
• update dependancies (go-ethereum, bee)
• use ens registry for storing username-address mapping
• introduce secondary location for storing encrypted mnemonic
• v2 apis for authentication
  • v2/user/login
  • v2/user/signup
  • v2/user/present
  • v2/user/delete
  • v2/user/migrate