IMS org id as input header instead of default parameter

[moritzraho]

Description

• x-gw-ims-org-id will be used in the upstream validator and is available as input header
• add a stub requiredHeaders parameter

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• I have signed the Adobe Open Source CLA.
• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.

[codecov]

Codecov Report

Merging #44 into master will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##            master       #44   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           17        17           
  Lines          302       302           
  Branches        39        39           
=========================================
  Hits           302       302           

Impacted Files	Coverage Δ
generators/add-action/analytics/index.js	100.00% <ø> (ø)
generators/add-action/campaign-standard/index.js	100.00% <ø> (ø)
generators/add-action/customer-profile/index.js	100.00% <ø> (ø)
generators/add-action/generic/index.js	100.00% <ø> (ø)
generators/add-action/target/index.js	100.00% <ø> (ø)

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