feat: server can actually create root and sections

Signed-off-by: kjuulh <contact@kjuulh.io>

crates/hyperlog-server/migrations/crdb/20240201211013_initial.sql

@@ -1 +1,14 @@
 -- Add migration script here
+
+CREATE TABLE roots (
+    id UUID NOT NULL PRIMARY KEY,
+    root_name VARCHAR(255) UNIQUE NOT NULL
+);
+
+CREATE TABLE nodes (
+    id UUID NOT NULL PRIMARY KEY,
+    root_id UUID NOT NULL,
+    path VARCHAR NOT NULL,
+    item_type VARCHAR NOT NULL,
+    item_content JSONB
+);