Add Graviton4 + platform and instance types using it

[jnioche]

Fixes #338

Sources

• https://www.nextplatform.com/2023/11/28/aws-adopts-arm-v2-cores-for-expansive-graviton4-server-cpu/
• https://github.com/aws/aws-graviton-getting-started
• https://aws.amazon.com/ec2/instance-types/

Exluding the 48xl instances which have slightly different characteristics (lower freq and 96 cores x 2-socket), those could be added later on.

Thanks
Thanks to TailPipe.AI for sharing their findings on the Graviton4 and agreeing to contribute them.

Comments

As Jamie who works for Tailpipe explained,

For Grav4 TDP, we are estimating 300. This is an assumption, based on the incremental TDP increases in the earlier Grav models, and the fact that other processors with the same clock speed and number of cores generally run at 360. We lowered this to 300 to avoid overestimating. 

We use a 96 thread count for Grav4, based on this source, which is also reported in WikiChip. We also assume the die size of 347.3 mm², the same as the Grav3, because AWS didn't announce anything about reduction in die size in their Grav4 press releases.

[da-ekchajzer]

Thanks for your PR. Could you add your comment on the data in the source column of the CSV file ? Otherwise, the data seems OK since there doesn't seem to be public data from AWS...

[jnioche]

@da-ekchajzer done