issue with orderBy [BUG]

[frydj]

Describe the bug When querying and trying to sort results, I'm getting an error message.

To Reproduce Steps to reproduce the behavior:

1. Transact some Yetis:

   {
   "ledger": "fluree-jld/369435906932737",
   "insert": [
   {
     "@id": "sarah",
     "@type": "Yeti",
     "name": "Sarah"
   },
   {
     "@id": "tim",
     "@type": "Yeti",
     "name": "Tim"
   },
   {
     "@id": "brad",
     "@type": "Yeti",
     "name": "Brad"
   },
   {
     "@id": "letty",
     "@type": "Yeti",
     "name": "Letty"
   },
   {
     "@id": "freddy",
     "@type": "Yeti",
     "name": "Freddy"
   }
   ]
   }

2. Try to query the Yetis with orderBy:

   {
   "from": "fluree-jld/369435906932737",
   "select": {
   "?s": [
     "*"
   ]
   },
   "where": {
   "@id": "?s",
   "@type": "Yeti"
   },
   "orderBy": [
   "DESC",
   "?s"
   ]
   }

Expected behavior The result set should be sorted by @id, but an error message is returned.

also please note: the error message being returned points at the wrong URL:

{
  "message": "{\"error\":\"db/invalid-query\",\"message\":\"Error in value for \\\"orderBy\\\"; orderBy clause must be variable or two-tuple formatted ['ASC' or 'DESC', var]; Provided: [\\\"DESC\\\" \\\"?s\\\"];  See documentation for details: https://next.developers.flur.ee/docs/reference/errorcodes#query-invalid-orderby\"}"
}

I think this should point to https://next.developers.flur.ee/docs/reference/error-codes#query-invalid-orderby

System (please complete the following information):

• OS: Apple M2 Pro 14.2 (23C64)
• Browser: chrome
• Version fluree/server docker image 771998956be2

[mpoffald]

Right now order-by expects a list, and non-capitalized sorting fns, eg: '(desc ?s). So the syntax used in this example is not intended to work.

However, we should also accept the same thing as a string, such as "(desc ?s)". And afaict this doesn't work atm. So we still need a fix, but for the string syntax rather than the vector syntax above.