Allow for custom DynamoDB table names for AWS remote state

[strickvl]

I updated the base AWS remote state module to allow users to specify the dynamodb table name (esp in the case where they already have a table with a particular name and they want to avoid the conflict).

Pre-requisites

Please ensure you have done the following:

• [x] I have read the CONTRIBUTING.md document.
• [ ] If my change requires a change to docs, I have updated the documentation accordingly.
• [ ] I have added tests to cover my changes.
• [x] I have based my new branch on develop and the open PR is targeting develop. If your branch wasn't based on develop read Contribution guide on rebasing branch to develop.

Types of changes

• [ ] Bug fix (non-breaking change which fixes an issue)
• [x] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)
• [ ] Other (add details above)

[safoinme]

can you clarify please when this dynmoDB table is used exactly?

[strickvl]

@safoinme We use the dynamodb table to lock TF so as to prevent multiple simultaneous terraform apply when using within a team. So it's part of the remote state (for AWS).