Ability to display/export the private key

[Danie0918]

Related issues：nervosnetwork/neuron#2123

[Danie0918]

【Ability to display/export the private key】

• Requirement Contents

1. Add a 'View Private Key' button on the Address Book and Asset Accounts Page.
2. The default mask of the private key is displayed, and the copy function is supported.
3. Hardware wallets do not support this feature.

[Kirl70]

Design Draft:
https://www.figma.com/design/6XNoimRDbFTTNm016rbIdU/Magickbase?node-id=43493-21253&t=NQNvTKho7ayN5gPO-1

[Keith-CY]

I found the clipboard will be cleared after I paste a password from 1password. It's a good feature and should be supported in copying private key.

[devchenyan]

nervosnetwork/neuron#3290