[UX] Optimize ohlcv lake-filling output

[trentmc]

When running olcv lake-filling, eg with pdr sim, output is e.g.

2024-02-20 11:07:29,061 INFO Fetch up to 1000 pts from timestamp=1695477600000, dt=2023-09-23_14:00:00.000
2024-02-20 11:07:31,827 INFO newest_ut_value: 1695777300000
2024-02-20 11:07:31,827 INFO Fetch up to 1000 pts from timestamp=1695777600000, dt=2023-09-27_01:20:00.000
2024-02-20 11:07:34,480 INFO newest_ut_value: 1696077300000
2024-02-20 11:07:34,481 INFO Fetch up to 1000 pts from timestamp=1696077600000, dt=2023-09-30_12:40:00.000
2024-02-20 11:07:37,149 INFO newest_ut_value: 1696377300000
2024-02-20 11:07:37,149 INFO Fetch up to 1000 pts from timestamp=1696377600000, dt=2023-10-04_00:00:00.000
2024-02-20 11:07:39,702 INFO newest_ut_value: 1696677300000
2024-02-20 11:07:39,702 INFO Fetch up to 1000 pts from timestamp=1696677600000, dt=2023-10-07_11:20:00.000
2024-02-20 11:07:42,173 INFO newest_ut_value: 1696977300000
2024-02-20 11:07:42,174 INFO Fetch up to 1000 pts from timestamp=1696977600000, dt=2023-10-10_22:40:00.000
2024-02-20 11:07:44,935 INFO newest_ut_value: 1697277300000
2024-02-20 11:07:44,935 INFO Fetch up to 1000 pts from timestamp=1697277600000, dt=2023-10-14_10:00:00.000

The problem is, it's interspersed with two lines. It's so much easier for the brain to process if it's all a single line, such as:

2024-02-20 11:07:29,061 INFO Fetch up to 1000 pts from timestamp=1695477600000, dt=2023-09-23_14:00:00.000
2024-02-20 11:07:31,827 INFO Fetch up to 1000 pts from timestamp=1695777600000, dt=2023-09-27_01:20:00.000
2024-02-20 11:07:34,481 INFO Fetch up to 1000 pts from timestamp=1696077600000, dt=2023-09-30_12:40:00.000
2024-02-20 11:07:37,149 INFO Fetch up to 1000 pts from timestamp=1696377600000, dt=2023-10-04_00:00:00.000
2024-02-20 11:07:39,702 INFO Fetch up to 1000 pts from timestamp=1696677600000, dt=2023-10-07_11:20:00.000
2024-02-20 11:07:42,174 INFO Fetch up to 1000 pts from timestamp=1696977600000, dt=2023-10-10_22:40:00.000
2024-02-20 11:07:44,935 INFO Fetch up to 1000 pts from timestamp=1697277600000, dt=2023-10-14_10:00:00.000

Or the above, also including info on newest_ut_value, in the same line.

Or the above as logging INFO, and the line with newest_ut_value as logging DEBUG.

TODOs

• Implement: "the above as logging INFO, and the line with newest_ut_value as logging DEBUG". Simplest.