Add permissions to install uninstall as part of the SDK if possible

[yavorg]

Just to be clear: not proposing any change in this PR. Mark this comment as resolved once you've read it :)

Originally posted by @bennbollay in fusebit/samples#10 (comment)

[bennbollay]

Original comment: it seems like there's a consistent pattern where things like install, uninstall, etc require ctx.caller.permissions but a few others do not. Might be worth codifying that in the manager.