feat: will now work with canary-release plugin

[hafstroem]

About the PR

This PR will allow the aws-request-signing plugin to work in conjunction with the Canary Release plugin. It achieves this by lowering the priority of the aws-request-signing plugin so that the signing will happen after the Canary Release plugin has determined the which host is the destination of the request. Furthermore a small code change will pick up the original service destination from an internal data structure that honors changes applied by the Canary Release plugin

Changelog

• Add: Added support for co-existence with Canary Release plugin!

Definition of Done - are you done?

Testing

• Has been tested locally.

Other

• Documentation has been updated (if applicable)
• No linting errors

[github-actions]

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