feat(core/database): basic implementation of User and File models

crates/core/database/src/models/files/mod.rs

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+mod model;
+
+pub use model::*;

crates/core/database/src/models/files/model.rs

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+auto_derived_partial!(
+    /// File
+    pub struct File {
+        /// Unique Id
+        #[serde(rename = "_id")]
+        pub id: String,
+        /// Tag / bucket this file was uploaded to
+        pub tag: String,
+        /// Original filename
+        pub filename: String,
+        /// Parsed metadata of this file
+        pub metadata: Metadata,
+        /// Raw content type of this file
+        pub content_type: String,
+        /// Size of this file (in bytes)
+        pub size: isize,
+
+        /// Whether this file was deleted
+        #[serde(skip_serializing_if = "Option::is_none")]
+        pub deleted: Option<bool>,
+        /// Whether this file was reported
+        #[serde(skip_serializing_if = "Option::is_none")]
+        pub reported: Option<bool>,
+
+        // TODO: migrate this mess to having:
+        // - author_id
+        // - parent: Parent { Message(id), User(id), etc }
+        #[serde(skip_serializing_if = "Option::is_none")]
+        pub message_id: Option<String>,
+        #[serde(skip_serializing_if = "Option::is_none")]
+        pub user_id: Option<String>,
+        #[serde(skip_serializing_if = "Option::is_none")]
+        pub server_id: Option<String>,
+
+        /// Id of the object this file is associated with
+        #[serde(skip_serializing_if = "Option::is_none")]
+        pub object_id: Option<String>,
+    },
+    "PartialFile"
+);
+
+auto_derived!(
+    /// Metadata associated with a file
+    #[serde(tag = "type")]
+    #[derive(Default)]
+    pub enum Metadata {
+        /// File is just a generic uncategorised file
+        #[default]
+        File,
+        /// File contains textual data and should be displayed as such
+        Text,
+        /// File is an image with specific dimensions
+        Image { width: isize, height: isize },
+        /// File is a video with specific dimensions
+        Video { width: isize, height: isize },
+        /// File is audio
+        Audio,
+    }
+);