Upgrade to use AWS SDK for Go v2

[richardcase]

/kind feature

Describe the solution you'd like
Now that the AWS SDK for Go version 2 is GA we should consider using it in CAPA. It brings a number of benefits including individual service modules and less use of pointers.

There are some things we need to be aware of that will complicate the change:

• The v2 SDK no longer includes *iface interfaces for each service. The expectation is that consumers of the SDK create their own interfaces to aid testing. See this open issue.

Environment:

• Cluster-api-provider-aws version: 0.6.4
• Kubernetes version: (use kubectl version):
• OS (e.g. from /etc/os-release):

[richardcase]

/assign

[richardcase]

/milestone Next

[richardcase]

/unassign

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[richardcase]

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[randomvariable]

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