Direct Link Changes for VLAN Mapping Dedicated Feature

[MalarvizhiK]

PR summary

Fixes: <! -- link to issue -->

PR Checklist

Please make sure that your PR fulfills the following requirements:

• The commit message follows the Angular Commit Message Guidelines.
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

PR Type

• Bugfix
• Feature
• Code style update (formatting, local variables)
• Refactoring (no functional changes, no api changes)
• New tests
• Build/CI related changes
• Documentation content changes
• Other (please describe)

What is the current behavior?

What is the new behavior?

Does this PR introduce a breaking change?

• Yes
• No

Other information

[MalarvizhiK]

My local test cases are passing

------------------------------
malark@Malars-MacBook-Pro networking-go-sdk % go test -v ./directlinkv1
=== RUN   TestDirectLinkV1
Running Suite: DirectLinkV1 Suite
=================================
Random Seed: 1709743568
Will run 328 of 328 specs
••
Ran 328 of 328 Specs in 524.008 seconds
SUCCESS! -- 328 Passed | 0 Failed | 0 Pending | 0 Skipped
--- PASS: TestDirectLinkV1 (524.10s)
PASS
ok  	github.com/IBM/networking-go-sdk/directlinkv1	525.320s

[sridhargk]

LGTM