fix: change permissions proto package so it doesn't clash with message

[ben-kugler]

Building these proto's in rust results in a conflict with module naming being the same.

error: module has the same name as its containing module
  --> /Users/benkugler/Documents/GitHub/mr2rs/target/debug/build/mr2rs-d0ae8c49e58f6ed8/out/permissions.rs:9:1
   |
9  | / pub mod permissions {
10 | |     #[derive(serde::Deserialize, serde::Serialize)]
11 | |     #[allow(clippy::derive_partial_eq_without_eq)]
12 | |     #[derive(Clone, PartialEq, ::prost::Oneof)]
...  |
18 | |     }
19 | | }
   | |_^