Dynamic permission request

[FrederikBolding]

Pending https://app.zenhub.com/workspaces/snaps-615b3a7c08d2b20015eb6c4e/issues/gh/metamask/snaps/1820

[eriknson]

Jamming on how this could work, ideas & input welcome!

[kenhkan]

From refinement:

• To begin implementation as we are close enough in terms of design
• We will add estimation after permission meeting on Friday

[eriknson]

Design: https://www.figma.com/file/Wlwk0cTx6PQkNhiX7vN13e/Snaps-Platform-v1?type=design&node-id=1015%3A11381&mode=design&t=fBFYbNSGLqFUPlXD-1

[eriknson]

Design ready, we'll revisit loading / success state later if it feels laggy

[eriknson]

To summarize, it's basically just the permission request screen alongside the revoke option in the settings dropdown to begin with. Permissions can be revoked silently w/out confirmation.