Provide paginators interop with the futures::Stream implementation

[Veetaha]

Describe the feature

The removal of futures::Stream implementation in 1.0 for paginators is a breaking change for lots of our code (both public: elastio/ssstar#125 and private).

Consider implementing futures::Stream for paginators again either:

• Unconditionally
• Under some cargo feature flag like feature = "futures"
• Via some interop crate that can convert aws SDK paginator into a futures::Stream implementor newtype. For example, like conversion of timestamps to chrono is implemented in aws_smithy_types_convert crate. This is the least-preferred variant, because we'll still need to explicitly import some extension trait and call .into_stream() or smth like that to use the paginator as a futures::Stream.

Basically, we need a shared interop code so that we don't have to write this boilerplate newtype wrapper over and over again in various places. Have a shared interop code that everyone in the open-source community can use.

Use Case

futures::Stream contains a lot of useful combinators with [Try]StreamExt traits and also a lot of our code works with impl futures::Stream. It's basically the golden standard akin to Iterator in the ecosystem and we've been using it everywhere including with the pre-1.0 AWS SDK code.

A note for the community

Community Note

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[rcoh]

This is actually done and pending release: smithy-lang/smithy-rs#3299

[rcoh]

Done! https://docs.rs/aws-smithy-types-convert/latest/aws_smithy_types_convert/stream/index.html

[github-actions]

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