Add support for x-ignore-order

[dikhan]

What problem does this Pull Request solve?

Please link to the issue number here: #233

P.S: Intentionally not making the PR title a feature request as it is not desired for this change to be outlined in the next release change-log.

Type of change

What type of change does your code introduce to the provider? Please put an x (w/o heading/trailing white spaces) in the boxes that apply:

• [x] New feature (change that adds new functionality)
• [ ] Bug-fix (change that fixes current functionality)
• [ ] Tech debt (enhances the current functionality)
• [ ] New release (pumps the version)

Checklist

Please put an x (w/o heading/trailing white spaces) in the boxes that apply:

• [x] I have read and followed the CONTRIBUTING guidelines
• [x] I have added tests that prove my fix is effective or that my feature works
• [x] I have made sure code compiles correctly and all tests are passing by running make test-all
• [x] I have added/updated necessary documentation (if appropriate)
• [x] I have added the following info to the title of the PR (pick the appropriate option for the type of change). This is important because the release notes will include this information.
  • [ ] Feature Request: PRs related to feature requests should have in the title [FeatureRequest: Issue #X] <PR Title>
  • [ ] Bug Fixes: PRs related to bug fixes should have in the title [BugFix: Issue #X] <PR Title>
  • [ ] Tech Debt: PRs related to technical debt should have in the title [TechDebt: Issue #X] <PR Title>
  • [ ] New Release: PRs related to a new release should have in the title [NewRelease] vX.Y.Z

Checklist for Admins

• [x] Label is populated
• [x] PR is assigned to the corresponding project
• [x] PR has at least 1 reviewer and 1 assignee

[codecov[bot]]

Codecov Report

Merging #234 into master will not change coverage. The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #234   +/-   ##
=======================================
  Coverage   90.77%   90.77%           
=======================================
  Files          56       56           
  Lines        3394     3394           
=======================================
  Hits         3081     3081           
  Misses        206      206           
  Partials      107      107           

Impacted Files	Coverage Δ
openapi/openapi_v2_resource.go	93.87% <100.00%> (ø)

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