fix(store): remove Android and iOS plugins, closes #1256 (#1695)

The Android and iOS support introduced on #1011 is not really supported - the Tauri path API correctly resolves the cache directory on mobile, and we can access those directly using Rust code.

This is a breaking change because we no longer uses the same directory to store the files - app_cache_dir returns a different location

plugins/store/src/error.rs

@@ -11,13 +11,6 @@ pub type Result<T> = std::result::Result<T, Error>;
 #[derive(thiserror::Error, Debug)]
 #[non_exhaustive]
 pub enum Error {
-    #[cfg(mobile)]
-    #[error(transparent)]
-    PluginInvoke(#[from] tauri::plugin::mobile::PluginInvokeError),
-    /// Mobile plugin handled is not initialized, Probably [`StoreBuilder::mobile_plugin_handle`] was not called.
-    #[cfg(mobile)]
-    #[error("Mobile plugin handled is not initialized, Perhaps you forgot to call StoreBuilder::mobile_plugin_handle")]
-    MobilePluginHandleUnInitialized,
     #[error("Failed to serialize store. {0}")]
     Serialize(Box<dyn std::error::Error + Send + Sync>),
     #[error("Failed to deserialize store. {0}")]