sync_diff_inspector:Add hint use_index when verifying SQL using primary key/unique key paging

[ryangao0513]

Is your feature request related to a problem? Please describe:
The SQL validation will default to using primary key/unique key paging. These SQL statements may use full table scann due to optimizer bugs or inaccurate statistic. Resulting in a long verification time.

Describe the feature you'd like:
When using primary key/unique key paging, add hint use_index to force index scan.

Describe alternatives you've considered:

Teachability, Documentation, Adoption, Migration Strategy: