Add filter string to mlflow experiment list_recorders function.

[chaosddp]

Description

Current RecorderCollector use default list_recorders function list all ACTIVE_ONLY runs, it may cost much time if there are too much active runs, with mlflow filter string support, we can reduce this number.

Motivation and Context

How Has This Been Tested?

• Pass the test by running: pytest qlib/tests/test_all_pipeline.py under upper directory of qlib.
• If you are adding a new feature, test on your own test scripts.

Screenshots of Test Results (if appropriate):

1. Pipeline test:
2. Your own tests:

Types of changes

• Fix bugs
• Add new feature
• Update documentation

[you-n-g]

@chaosddp
It looks great now! Thanks :)