[Module Proposal]: `avm-utl-network-subnet-azapi-replicator`

### Check for previous/existing GitHub issues/module proposals

- [x] I have checked for previous/existing GitHub issues/module proposals.

### Check this module doesn't already exist in the module indexes

- [x] I have checked for that this module doesn't already exist in the module indexes.

### Bicep or Terraform?

Terraform

### Module Classification?

Utility Module

### Module Name

avm-utl-network-subnet-azapi-replicator

### Module Details

An utl module that helps users to migrate their `azurerm_subnet` resource to AzAPI provider

### Do you want to be the owner of this module?

Yes

### Module Owner's GitHub Username (handle)

lonegunmanb

### (Optional) Secondary Module Owner's GitHub Username (handle)

_No response_