feat: support for directlink connection type

[kennburger]

PR summary

Support for Directlink type gateway connection

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
• [X ] 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
• [X ] No

Other information

[codecov]

Codecov Report

Merging #36 (48fe504) into master (c08696e) will decrease coverage by 0.45%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master      #36      +/-   ##
==========================================
- Coverage   88.59%   88.13%   -0.46%     
==========================================
  Files          37       37              
  Lines       23773    23775       +2     
==========================================
- Hits        21061    20954     -107     
- Misses       2712     2821     +109     

Impacted Files	Coverage Δ
...oud_networking_services/transit_gateway_apis_v1.py	90.39% <100.00%> (-0.41%)	⬇️
ibm_cloud_networking_services/dns_svcs_v1.py	89.19% <0.00%> (-3.12%)	⬇️
...oud_networking_services/direct_link_provider_v2.py	87.94% <0.00%> (-0.72%)	⬇️
ibm_cloud_networking_services/direct_link_v1.py	89.50% <0.00%> (-0.28%)	⬇️

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[ajay-malhotra1]

🎉 This PR is included in version 0.10.0 🎉

The release is available on GitHub release

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