Unused items in zenoh-plugin-storage-manager

[fuzzypixelz]

Describe the bug

warning: unused import: `PluginDiff`
  --> zenoh/src/net/runtime/adminspace.rs:25:41
   |
25 | use zenoh_plugin_trait::{PluginControl, PluginDiff, PluginStatus};
   |                                         ^^^^^^^^^^
   |
   = note: `#[warn(unused_imports)]` on by default

warning: unused variable: `active_plugins`
   --> zenoh/src/net/runtime/adminspace.rs:212:17
    |
212 |         let mut active_plugins = runtime
    |                 ^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_active_plugins`
    |
    = note: `#[warn(unused_variables)]` on by default

warning: variable does not need to be mutable
   --> zenoh/src/net/runtime/adminspace.rs:212:13
    |
212 |         let mut active_plugins = runtime
    |             ----^^^^^^^^^^^^^^
    |             |
    |             help: remove this `mut`
    |
    = note: `#[warn(unused_mut)]` on by default

   Compiling zenoh_backend_traits v1.0.0-dev (/home/mahmoud/source/zenoh/plugins/zenoh-backend-traits)
   Compiling zenoh-plugin-storage-manager v1.0.0-dev (/home/mahmoud/source/zenoh/plugins/zenoh-plugin-storage-manager)
warning: associated function `start_plugin` is never used
  --> zenoh/src/net/runtime/adminspace.rs:99:8
   |
97 | impl AdminSpace {
   | --------------- associated function in this implementation
98 |     #[cfg(feature = "plugins")]
99 |     fn start_plugin(
   |        ^^^^^^^^^^^^
   |
   = note: `#[warn(dead_code)]` on by default

To reproduce

1. cargo build --package zenoh-plugin-storage-manager

System info

• ref: e73a89d