feat: custom gossip implementation (#181)

* .

* rename global to app_state

* refactor event tracker

* gossip

* .

* .

crates/app_state/src/constants.rs

@@ -0,0 +1,61 @@
+pub const APP_NAME: &str = "Coop";
+pub const APP_ID: &str = "su.reya.coop";
+pub const APP_PUBKEY: &str = "dW50cnVzdGVkIGNvbW1lbnQ6IG1pbmlzaWduIHB1YmxpYyBrZXk6IDc4MkNFRkQ2RkVGQURGNzUKUldSMTMvcisxdThzZUZraHc4Vno3NVNJek81VkJFUEV3MkJweGFxQXhpekdSU1JIekpqMG4yemMK";
+pub const APP_UPDATER_ENDPOINT: &str = "https://coop-updater.reya.su/";
+pub const KEYRING_URL: &str = "Coop Safe Storage";
+
+pub const ACCOUNT_IDENTIFIER: &str = "coop:user";
+pub const SETTINGS_IDENTIFIER: &str = "coop:settings";
+
+/// Bootstrap Relays.
+pub const BOOTSTRAP_RELAYS: [&str; 5] = [
+    "wss://relay.damus.io",
+    "wss://relay.primal.net",
+    "wss://relay.nos.social",
+    "wss://user.kindpag.es",
+    "wss://purplepag.es",
+];
+
+/// Search Relays.
+pub const SEARCH_RELAYS: [&str; 1] = ["wss://relay.nostr.band"];
+
+/// NIP65 Relays. Used for new account
+pub const NIP65_RELAYS: [&str; 4] = [
+    "wss://relay.damus.io",
+    "wss://relay.primal.net",
+    "wss://relay.nostr.net",
+    "wss://nos.lol",
+];
+
+/// Messaging Relays. Used for new account
+pub const NIP17_RELAYS: [&str; 2] = ["wss://nip17.com", "wss://auth.nostr1.com"];
+
+/// Default relay for Nostr Connect
+pub const NOSTR_CONNECT_RELAY: &str = "wss://relay.nsec.app";
+
+/// Default retry count for fetching NIP-17 relays
+pub const RELAY_RETRY: u64 = 2;
+
+/// Default retry count for sending messages
+pub const SEND_RETRY: u64 = 10;
+
+/// Default timeout (in seconds) for Nostr Connect
+pub const NOSTR_CONNECT_TIMEOUT: u64 = 200;
+
+/// Default timeout (in seconds) for Nostr Connect (Bunker)
+pub const BUNKER_TIMEOUT: u64 = 30;
+
+/// Total metadata requests will be grouped.
+pub const METADATA_BATCH_LIMIT: usize = 100;
+
+/// Maximum timeout for grouping metadata requests. (milliseconds)
+pub const METADATA_BATCH_TIMEOUT: u64 = 300;
+
+/// Default width of the sidebar.
+pub const DEFAULT_SIDEBAR_WIDTH: f32 = 240.;
+
+/// Image Resize Service
+pub const IMAGE_RESIZE_SERVICE: &str = "https://wsrv.nl";
+
+/// Default NIP96 Media Server.
+pub const NIP96_SERVER: &str = "https://nostrmedia.com";