Issue #3071168: Add custom http headers to requests

Provides the ability for users to add custom HTTP headers to requests.

Closes #3071168

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• 4a72577e - Save http_headers setting as array and added test coverage.

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resolved all threads

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• c8601710 - Fixed getting default value for http headers on the feed edit form.

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• ee0ec0a0 - (cspell) ignore text used in http header example.

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• f7eda205 - Fixed namespaces in http fetcher form tests.

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