IX Adapter feature dynamic account id support

[mmoschovas]

🔧 Type of changes

• [ ] new bid adapter
• [ ] bid adapter update
• [X] new feature
• [ ] new analytics adapter
• [ ] new module
• [ ] module update
• [ ] bugfix
• [ ] documentation
• [ ] configuration
• [ ] dependency update
• [ ] tech debt (test coverage, refactorings, etc.)

✨ What's the context?

What's the context for the changes? Macro support for IX bid endpoint. Ability to pass accountId to PBS for IX to be autopopulated in endpoint to handle multiople account id scenarios

🧠 Rationale behind the change

Why did you choose to make these changes? Were there any trade-offs you had to consider? See above

[AntoxaAntoxic]

Hi @mmoschovas

Do you have a PR for PBS Go? If yes, please add the link here

[osulzhenko]

@mmoschovas any updates?

[osulzhenko]

will put it on hold for now