Decouple core Yaak logic from Tauri (#354)

crates/yaak-models/migrations/20240829131004_plugins.sql

@@ -0,0 +1,12 @@
+CREATE TABLE plugins
+(
+    id         TEXT                               NOT NULL
+        PRIMARY KEY,
+    model      TEXT     DEFAULT 'plugin'          NOT NULL,
+    created_at DATETIME DEFAULT CURRENT_TIMESTAMP NOT NULL,
+    updated_at DATETIME DEFAULT CURRENT_TIMESTAMP NOT NULL,
+    checked_at DATETIME NULL,
+    enabled    BOOLEAN                            NOT NULL,
+    directory  TEXT NULL                          NOT NULL,
+    url        TEXT NULL
+);