feat: add new_resource_manager_client_options hook to manager template

[tcsavage]

Issue #, if available: aws-controllers-k8s/community#2237

Description of changes:

In order to support some S3-compatible APIs (e.g. LocalStack on a local dev cluster) it may be necessary to force the S3 client to use "path-style" URLs (e.g. http://host/bucket/key).

This PR adds a hook injection point in newResourceManager to allow service controllers to pass custom options to the AWS SDK client constructor.

This will let the S3 controller set UsePathStyle based on the value set in its controller config.

Associated PRs:

• s3-controller#214 uses this hook to control UsePathStyle.
• runtime#233 adds a new config option used by the s3-controller to set UsePathStyle.

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[ack-prow]

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This pull-request has been approved by: tcsavage
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[ack-prow]

Hi @tcsavage. Thanks for your PR.

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