[Feature]: Support smaller AWS CPU instances

[jvstme]

Problem

The smallest AWS CPU instance dstack supports is t2.small (1xCPU, 2GB RAM). Some workflows may benefit from cheaper instances with less RAM and a lower baseline burstable CPU performance.

Solution

Support instances from the t2, t3, and t3a families that are smaller than t2.small.

Supporting larger instances from these families is questionable, since dstack does not distinguish burstable instances, so the difference between low-performance (t2, t3) and higher-performance (c5, m5) instances won't be visible in the offers list.

Workaround

No response

Would you like to help us implement this feature by sending a PR?

Yes