Add support for Dynamic IP Allocation

[kumdeepakgit]

Description

Problem

Currently, only logical networks of type "Static" can be created. The "Static" type is hardcoded as shown below:

  subnet_0_properties_full = {
    addressPrefix      = var.address_prefix, # compute from starting address and ending address
    ipAllocationMethod = "Static",
    ipPools = [{
      info  = {}
      start = var.starting_address
      end   = var.ending_address
    }]

Solution

This PR introduces a way to specify the type of logical network through the following variable:

1. ip_allocation_method [Optional] - Specifies whether the IP address allocation should be "Static" or "Dynamic". This variable is optional and defaults to Dynamic.

How to test

Navigate to examples/dhcp/ and execute the terraform commands.

Type of Change

• [ ] Non-module change (e.g. CI/CD, documentation, etc.)
• [ ] Azure Verified Module updates:
  • [ ] Bugfix containing backwards compatible bug fixes
  • [ ] Someone has opened a bug report issue, and I have included "Closes #{bug_report_issue_number}" in the PR description.
  • [ ] The bug was found by the module author, and no one has opened an issue to report it yet.
  • [ ] Feature update backwards compatible feature updates.
  • [ ] Breaking changes.
  • [ ] Update to documentation

Checklist

• [ ] I'm sure there are no other open Pull Requests for the same update/change
• [ ] My corresponding pipelines / checks run clean and green without any errors or warnings
• [ ] I did run all pre-commit checks