Standardize logging and error handling

- Introduce new types: LoggedResult and LoggedError
- Introduce new extension methods to log and add additional msgs
- Never exit when logging error messages in Rust (all errors should be
  handled by using Result and Rust's error propagation)
- Remove all usages of anyhow as it doesn't fit Magisk's use cases

native/src/Cargo.toml

@@ -8,7 +8,6 @@ cxx = { path = "external/cxx-rs" }
 cxx-gen = { path = "external/cxx-rs/gen/lib" }
 libc = "0.2"
 cfg-if = "1.0"
-anyhow = "1.0"
 num-traits = "0.2"
 num-derive = "0.3"
 thiserror = "1.0"