Decouple core Yaak logic from Tauri (#354)

crates/yaak-models/migrations/20231022205109_environments.sql

@@ -0,0 +1,15 @@
+CREATE TABLE environments
+(
+    id          TEXT                               NOT NULL
+        PRIMARY KEY,
+    model       TEXT     DEFAULT 'workspace'       NOT NULL,
+    created_at  DATETIME DEFAULT CURRENT_TIMESTAMP NOT NULL,
+    updated_at  DATETIME DEFAULT CURRENT_TIMESTAMP NOT NULL,
+    deleted_at  DATETIME,
+    workspace_id TEXT                               NOT NULL
+        REFERENCES workspaces
+            ON DELETE CASCADE,
+    name        TEXT                               NOT NULL,
+    data        TEXT                               NOT NULL
+        DEFAULT '{}'
+);