Version upgrades: Terraform -> v1.0.0, AWS TF Provider -> v3.37.0, AWS TF EKS module -> v15.2.0

[awsitcloudpro]

Issue #, if available:
Issue #4

Description of changes:
Changes necessary to use this repo with Terraform v0.15.0 / v1.0.0:

• Used TF function tomap() instead of map(), which is deprecated and no longer available.
• Used TF function tolist() instead of list(), which is deprecated and no longer available. The list() function was used in the older version of the dependency module terraform-aws-modules/eks/aws, so to it was necessary to upgrade the module version to 15.2.0, which in turn also necessitated TF AWS provider version upgrade to 3.37.0.
• Updated Deployment Steps in README to use the source directory as the current working directory, as required by TF v0.15.0+. Also fixed the pre-requisites bullets.

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[vara-bonthu]

@awsitcloudpro Thanks for your contribution. I will review and test the PR this weekend and merge it accordingly

[awsitcloudpro]

@vara-bonthu I had forgotten to update Makefile, did that now.

[vara-bonthu]

@awsitcloudpro Could you please resolve the conflicts and submit the PR? Alos, Please ensure your Terraform version update is working end to end by deploying the DEV cluster as per the instructions end to end

[awsitcloudpro]

@vara-bonthu I have resolved the conflicts that happened due to the recent main branch commits. I have also re-tested the version upgrade end-to-end, including Agones and Traefik IC deployment. Everything worked well.

[awsitcloudpro]

Closing, as the new release incorporates TF version upgrade.