feat: Update Terraform minimum supported version to v0.13.1

[bryantbiggs]

Description

• Update Terraform minimum supported version to v0.13.1
• Fix cross-account TGW sharing via RAM (see 120533a)
• Re-order tag values to allow resource specific tags to override Name tag used (this change should be a no-op for users)
• Formatting and code organization updates to align with current standards
• Replace use of lookup() with try()
• Fix examples to use VPC and subnets created by the examples rather than creating the VPCs but relying on the users account default VPC
• Replace deprecated aws_subnet_ids data source in examples with aws_subnets
• Update provider required version schema to use current format
• Remove example data sources and use module outputs directly

Motivation and Context

• To align with current standards
• Closes fix: Avoid error looking up tgw_route_table when resource is not crea… #67
• Relates to TGW with VPCs from other accounts #46
• Relates to Bug when creating a VPC attachment into the TGW shared from different account #47
• Relates to Invalid index #56
• Relates to Creating a shared TGW across multiple AWS accounts fails  #61

Breaking Changes

• No

How Has This Been Tested?

• I have tested and validated these changes using one or more of the provided examples/* projects
  • Validated before/after of examples/complete
  • Unable to validate examples/multi-account due to issue stated in fix: Avoid error looking up tgw_route_table when resource is not crea… #67 (exists prior to this change so unable to apply)

[antonbabenko]

This PR is included in version 2.6.0 🎉

[antonbabenko]

Good to see that you have some time for this module. I made it a long time ago and used it just on one project. Thanks!

[github-actions]

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