build: use patched version of aws-sdk-ec2

[xxchan]

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What's changed and what's your intention?

alternative solution to replace #15368, without introducing feature flag.

The main motivation is to make the dependency aws-sdk-ec2 optional.
It is very rarely used in development, but contributes to more than half of the compile time.

Check https://github.com/risingwavelabs/rw-aws-sdk-ec2/commits/main/ to see what's changed.

Before (4m 41.2s total)

After (4m 17.6s total)

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[tabVersion]

this approach seems more adorable

[StrikeW]

This approach LGTM. But the reduction of overall compilation time seems not much (24 secs).

[xxchan]

But the reduction of overall compilation time seems not much (24 secs).

This might be because of the suboptimal build graph. Previously aws-sdk-ec2 is a major blocker, but after removing it, another blocker comes. Optimizing it can make it possible to further optimize in the future. (Maybe also help save energy...)

[xxchan]

Just tested release build. 14m53s -> 13m22s, 91s less! (aws-sdk-ec2 compiles 402.0s alone...)