ctk tail: Use 0.5 seconds polling interval instead of 0.1

It is mostly sufficient and still provides enough interactivity.
By reducing the frequency, it will incur less spam on sys.jobs_log
itself.

cratedb_toolkit/cmd/tail/cli.py

@@ -22,7 +22,9 @@
 )
 @click.option("--format", "format_", type=str, required=False, help="Select output format. Default: log / jsonl")
 @click.option("--follow", "-f", is_flag=True, required=False, help="Follow new records added, by polling the table")
-@click.option("--interval", "-i", type=float, required=False, help="When following the tail, poll each N seconds. Default: 0.1")
+@click.option(
+    "--interval", "-i", type=float, required=False, help="When following the tail, poll each N seconds. Default: 0.5"
+)
 @click.option("--verbose", is_flag=True, required=False, help="Turn on logging")
 @click.option("--debug", is_flag=True, required=False, help="Turn on logging with debug level")
 @click.argument("resource", nargs=-1, type=click.UNPROCESSED)

cratedb_toolkit/cmd/tail/main.py

@@ -86,13 +86,13 @@ class TableTailer:
 
     db: DatabaseAdapter
     resource: TableAddress
-    interval: float = 0.1
+    interval: t.Optional[float] = None
     format: t.Optional[str] = None
 
     def __attrs_post_init__(self):
         self.db.internal = True
         if self.interval is None:
-            self.interval = 0.1
+            self.interval = 0.5
         if not self.format:
             if self.resource.fullname == "sys.jobs_log":
                 self.format = "log"