stub set tls ext ticket callbacks #208

Job	Run time
Clang Tidy	15s
Clippy	29s
Clippy nightly (optional)	37s
Build+test (stable, ubuntu-24.04)	1m 55s
Check for documentation errors	49s
Build+test (stable, ubuntu-22.04)	1m 34s
Format	22s
Miri	1m 8s
Build+test (beta, ubuntu-24.04)	1m 47s
Build+test (beta, ubuntu-22.04)	1m 46s
Packaging	3m 4s
Build+test (nightly, ubuntu-24.04)	1m 47s
Valgrind	2m 25s
Build+test (nightly, ubuntu-22.04)	1m 49s
	19m 47s

Provide feedback