0.7.0

What's Changed

• Forces CRT depenency to use pinned version by @epau in #751
• Fixes XML encoding issues by @epau in #740
• feat: Smithy Waiters by @jbelkins in #755
• chore: bump models by @epau in #770
• chore: update client runtime version to 0.7.0 by @epau in #772

Full Changelog: https://github.com/awslabs/aws-sdk-swift/commits/0.7.0