Enhanced crash_gen tool to run multiple instances concurrently, by using dynamic names for tables and databases

Multi-instance code working for single instance case, ready to refactor crash_gen tool into multiple files

fix: docs and tests typos, taos_fetch_subfields --> taos_fetch_fields, taos_subfields_count --> taos_field_count

Bumps [junit](https://github.com/junit-team/junit4) from 4.12 to 4.13.1.
- [Release notes](https://github.com/junit-team/junit4/releases)
- [Changelog](https://github.com/junit-team/junit4/blob/main/doc/ReleaseNotes4.12.md)
- [Commits](https://github.com/junit-team/junit4/compare/r4.12...r4.13.1)
Signed-off-by: Ndependabot[bot] <support@github.com>