Improve TT Number validation.

docs/source/module/utils/types.rst

gso/utils/types.py

gso/workflows/iptrunk/create_iptrunk.py

gso/workflows/iptrunk/deploy_twamp.py

gso/workflows/iptrunk/migrate_iptrunk.py

gso/workflows/iptrunk/modify_isis_metric.py

gso/workflows/iptrunk/modify_trunk_interface.py

gso/workflows/iptrunk/terminate_iptrunk.py

gso/workflows/router/create_router.py

gso/workflows/router/promote_p_to_pe.py

gso/workflows/router/redeploy_base_config.py

gso/workflows/router/terminate_router.py

gso/workflows/router/update_ibgp_mesh.py