Backfill Optional Auth Trait

[aajtodd]

Describe the bug

Several services have operations that are not meant to be signed or require credentials.

Examples from:

• Go
• Swift
• Rust
• Our own

Kotlin and Rust are only backfilling STS operations currently.

Note that neither Swift or Go is complete. Each is missing some the other has. We need to get the models fixed upstream.

Expected behavior

Operations with optional auth shouldn't have the sigv4 middleware applied or require credentials.

Current behavior

N/A

Steps to Reproduce

N/A

Possible Solution

N/A

Context

N/A

AWS Kotlin SDK version used

v0.13.1-beta

Platform (JVM/JS/Native)

JVM

Operating System and version

N/A

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