Problem

Needs #3114 so it works with env var configuration.

Closes: #2907

Solution

Add custom_headers in HttpConfig.

Note: Env var configuration would work only if whole transport is set with dynamic env vars introduced in #3114. This means you can't e.g. set OPENLINEAGE_URL and OPENLINEAGE__TRANSPORT__CUSTOM_HEADERS. Instead of OPENLINEAGE_URL set OPENLINEAGE__TRANSPORT__TYPE=http and OPENLINEAGE__TRANSPORT__URL=....

Checklist

• You've signed-off your work
• Your pull request title follows our guidelines
• Your changes are accompanied by tests (if relevant)
• Your change contains a small diff and is self-contained
• You've updated any relevant documentation (if relevant)
• Your comment includes a one-liner for the changelog about the specific purpose of the change (not required for changes to tests, docs, or CI config)
• You've versioned the core OpenLineage model or facets according to SchemaVer (if relevant)
• You've added a header to source files (if relevant)

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