Merge quantumdex and valueimpression adapters

[bretg]

Description

As found in #5356 The valueimpressionBidAdapter is completely identical to quantumdexBidAdapter except, of course, bidder code.

@thuyhq has expressed a willingness to merge these adapters at some point, though they're not able to do this at the moment as it will affect their business.

This issue tracks the open item.

[robertrmartinez]

Thank you @thuyhq for taking this!

#5405

[stale]

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