SQL/Blob: Add support for blob storage to SQL backend (#98192)

pkg/storage/unified/sql/testdata/mysql--resource_blob_insert-basic.sql

@@ -0,0 +1,24 @@
+INSERT INTO `resource_blob`
+  (
+    `uuid`, 
+    `created`,
+    `group`,
+    `resource`,
+    `namespace`,
+    `name`,
+    `value`,
+    `hash`,
+    `content_type`
+  )
+  VALUES (
+    'abc', 
+    '2023-12-31 21:00:00 +0000 UTC', 
+    'g',
+    'r',
+    'x',
+    'name',
+    '[97 98 99 100 101 102 103]',
+    'xxx',
+    'text/plain'
+  )
+;