Add X-Correlator to OAS and update linting rules

[eric-murray]

What type of PR is this?

• enhancement/feature

What this PR does / why we need it:

CAMARA API design guidelines linting rules have been updated

• X-Correlator header must now be included in OAS definition

Draft CAMARA linting rules have been updated

Which issue(s) this PR fixes:

N/A

Special notes for reviewers:

None

Changelog input

 release-note
 - Add X-Correlator header to OAS
 - Update linting rules

Additional documentation

None