feat: Conditionally enable public and private subnet tags

[kaykhan]

Description

Introduces 2 new variables enable_private_subnet_tags and enable_public_subnet_tags.

Motivation and Context

#1145

Breaking Changes

These new variable are set to true by default so i assume it would not introduce any breaking change

How Has This Been Tested?

• I have updated at least one of the examples/* to demonstrate and validate my change(s)
• I have tested and validated these changes using one or more of the provided examples/* projects

• I have executed pre-commit run -a on my pull request

[kaykhan]

:(

╷
│ Error: Unsupported block type
│ 
│   on ../../main.tf line 114, in resource "aws_subnet" "public":
│  114:   dynamic "tags" {
│ 
│ Blocks of type "tags" are not expected here.
╵
╷
│ Error: Unsupported block type
│ 
│   on ../../main.tf line 255, in resource "aws_subnet" "private":
│  255:   dynamic "tags" {
│ 
│ Blocks of type "tags" are not expected here.
╵

[github-actions]

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