implement pragma table_info

Both () and = variants covered. It is important to make sure that
the transaction is a read transaction, so we cannot hide all that logic
inside update_pragma, and have to make our decision before that.

vendored/sqlite3-parser/src/parser/ast/mod.rs

@@ -1593,6 +1593,8 @@ pub enum PragmaName {
     JournalMode,
     /// trigger a checkpoint to run on database(s) if WAL is enabled
     WalCheckpoint,
+    /// returns information about the columns of a table
+    TableInfo,
 }
 
 impl FromStr for PragmaName {
@@ -1603,6 +1605,7 @@ impl FromStr for PragmaName {
             "cache_size" => Ok(PragmaName::CacheSize),
             "wal_checkpoint" => Ok(PragmaName::WalCheckpoint),
             "journal_mode" => Ok(PragmaName::JournalMode),
+            "table_info" => Ok(PragmaName::TableInfo),
             _ => Err(()),
         }
     }