[epic] Userspace Permissions

[tomholford]

Parent issue for the Userspace Permissions epic.

• migrate urbit/api to a new gear directory in tloncorp/landscape #175
  • meta: deprecate @urbit/api urbit/webterm#3
  • gear: migrate from deprecated packages + use gear #184
• migrate tloncorp/landscape references types and api pokes #176
  • gear: migrate from deprecated packages + use gear #184
• implement new types and pokes for userspace permissions #177
  • gear: permissions types #195
• build out the components needed for the new userspace permissions UI (storybook) #178
  • permissions: UI + Storybook #196
• implement basic e2e flow for userspace permissions (happy path) #179
  • permissions: UI + Storybook #196
• implement the detailed view for userspace permissions #180
  • permissions: UI + Storybook #196
• deploy userspace permissions to staging, validate with QA #181

[tomholford]

An update for those following along at home: this is currently blocked. After some discussion with Ted, Tinnus has determined that some additional backend changes are needed to implement this feature as designed. In the meantime, I'm prioritizing other tasks.