add 2080ti, 2080 into hardware.ts

[thien]

added FP16 (half) FLOPs for the GPUs listed in title.

sources:

• https://www.techpowerup.com/gpu-specs/geforce-rtx-2080.c3224
• https://www.techpowerup.com/gpu-specs/geforce-rtx-2080-ti.c3305
• https://www.techpowerup.com/gpu-specs/geforce-rtx-2070.c3252 (as x-reference to know which number to use).

[julien-c]

nice!

[Vaibhavs10]

Thanks for adding this! 🤗

Will wait for @pcuenca to give this an LGTM too - since he verified the numbers for other hardware on the list too!

[pcuenca]

Thanks for updating @Vaibhavs10! Fixing the lint and merging!

[pcuenca]

Thanks a lot @thien 🙌 My first GPU was a 2080 Ti in 2018, I still use it :)