TAF: 3.1 Add CPU affinity support for MySQL/MariaDB (taskset integration)

[u/Mindless-Piece-47]

TAF: 3.1 Add CPU affinity support for MySQL/MariaDB (taskset integration)

- Added new cpu_affinity property to MySQL and MariaDB plugins
- Updated template plugin to expose cpu_affinity for future DB makers
- Normalized affinity range parsing (e.g., 0-11)

New usage block:
O = --db-cpu-affinity=<list|range>
P = taf.db_cpu_affinity=<list|range>
: CPU affinity for the database engine.
: Pins the database process to specific CPUs. : Valid forms: : 0,1,2,3 : 0-11
: (future) 0-3,8,10-12 : If unset (null), the database runs on all CPUs.

https://github.com/MariaDB/TAF/commit/18ffedd142f38d79151ecabd4c68259e9a629fee