Commits on Oct 23, 2023

1. libsql-server,admin: add top-k queries to stats …

   Top 10 most expensive queries are now stored and available
   in the admin api. The ranking is kept in-memory only.
   
   ```
   $ curl -s http://localhost:8081/v1/namespaces/default/stats | jq '.top_queries[]'
   {
     "rows_written": 0,
     "rows_read": 1,
     "query": "EXPLAIN SELECT * FROM t;"
   }
   {
     "rows_written": 0,
     "rows_read": 1,
     "query": "SELECT 1;"
   }
   {
     "rows_written": 2,
     "rows_read": 0,
     "query": "INSERT INTO t VALUES (1, 'a'), (2, 'bb');"
   }
   {
     "rows_written": 2,
     "rows_read": 1,
     "query": "create table t(id, v)"
   }
   {
     "rows_written": 0,
     "rows_read": 4,
     "query": "SELECT * FROM t;"
   }
   {
     "rows_written": 2,
     "rows_read": 4,
     "query": "INSERT INTO t SELECT * FROM t;"
   }
   ```

   

   psarna committed Oct 23, 2023
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2. sqld: use unexpanded SQL for top queries …

   ... so that we don't distinguish between different bound values
   when tracking queries, and instead only gather information
   about the raw query string that may contain wildcards, like:
    INSERT INTO t VALUES (?, ?, ?);

   

   psarna committed Oct 23, 2023
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