Add C++20 modules support

[kelteseth]

Describe the feature

Hi,
I'm not a user of aws-sdk-cpp, but I'm tracking the progress of c++20 modules support on https://arewemodulesyet.org/ and this is the issue we are linking to in our table of c++20 modules support.

Use Case

Modules are part of C++20 and should greatly increase compile times, see https://en.cppreference.com/w/cpp/language/modules

Proposed Solution

No response

Other Information

No response

Acknowledgements

• I may be able to implement this feature request
• This feature might incur a breaking change

[jmklix]

Thanks for opening this feature request and making the effort to get modules widely supported. We are currently blocked by curl not supporting modules yet. This is something that we would like to add support for, but we currently don't have any timeline for when this might be supported by this sdk.