Support users to set proxy address

[Popoulosss]

• Proxy setting page
• Only key account can set a proxy

Figma link (updated)

Preview

[Popoulosss]

• Display proxy state
• Tooltip to show description
• For account with a proxy set, all extrinsics will be wrapped by proxy#proxy calls. Refer here for proxy calls.
• We should show the proxy account on every sign modal for key account who have set a proxy.

Figma link

Preview

[wliyongfeng]

Note:

1. Only key account can set a proxy
2. For account with a proxy set, all extrinsics will be wrapped by proxy#proxy calls. Refer here for proxy calls.
3. We should show the proxy account on every sign modal for key account who have set a proxy.
4. We need a dedicated service to check the on-chain proxy settings.