[SPARK-48999][SS] Divide PythonStreamingDataSourceSimpleSuite

### What changes were proposed in this pull request?
Divide PythonStreamingDataSourceSuite into PythonStreamingDataSourceSuite, PythonStreamingDataSourceSimpleSuite and PythonStreamingDataSourceWriteSuite

### Why are the changes needed?
It is reported that PythonStreamingDataSourceSuite runs too long. We need to divide it to allow better parallelism.

### Does this PR introduce _any_ user-facing change?
No.

### How was this patch tested?
Watch CI to cover the three new tests and pass.

### Was this patch authored or co-authored using generative AI tooling?
No.

Closes #47479 from siying/divide_python_stream_suite.

Authored-by: Siying Dong <siying.dong@databricks.com>
Signed-off-by: allisonwang-db <allison.wang@databricks.com>

Author: siying