Redis库列表显示保留有数据的，并加上key的数量

[feiazifeiazi]

功能需求见：https://github.com/hhyo/Archery/discussions/2608

1. 变更基类方法 get_all_databases，加上参数。
2. 当请求来源是 SQL查询时，Redis库列表只返回有数据的。 SQL上线的地方不变。

效果图：

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 78.37838% with 8 lines in your changes missing coverage. Please review.

Project coverage is 77.14%. Comparing base (24f86de) to head (d3dcb90).

Files	Patch %	Lines
sql/instance.py	0.00%	4 Missing :warning:
sql/engines/redis.py	86.36%	3 Missing :warning:
sql_api/api_instance.py	0.00%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #2705 +/- ## ======================================= Coverage 77.13% 77.14% ======================================= Files 117 117 Lines 16169 16204 +35 ======================================= + Hits 12472 12500 +28 - Misses 3697 3704 +7 ```

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