Initialize aws Client in ResourceType

[hongil0316]

Description

Part of #494.
Initialize aws Client in ResourceType
This should be no-op change.

A bit more context. I was thinking of refactoring one by one but noticed a lot of merge conflicts one after the other. Making all changes that could resolve merge conflicts in the future!

TODOs

Read the Gruntwork contribution guidelines.

• Update the docs.
• Run the relevant tests successfully, including pre-commit checks.
• Ensure any 3rd party code adheres with our license policy or delete this line if its not applicable.
• Include release notes. If this PR is backward incompatible, include a migration guide.
• [] Attention Grunts - if this PR adds support for a new resource, ensure the nuke_sandbox and nuke_phxdevops jobs in .circleci/config.yml have been updated with appropriate exclusions (either directly in the job or via the .circleci/nuke_config.yml file) to prevent nuking IAM roles, groups, resources, etc that are important for the test accounts.

Release Notes (draft)

Added / Removed / Updated [X].

Updated [Initialize aws Client in ResourceType]

Migration Guide