Standardized COPPA support

[msm0504]

Type of change

• Bugfix
• Feature
• New bidder adapter
• Code style update (formatting, local variables)
• Refactoring (no functional changes, no api changes)
• Build related changes
• CI related changes
• Does this change affect user-facing APIs or examples documented on http://prebid.org?
• Other

Description of change

Support coppa flag being set in Prebid config and then sent to OpenRTB and individual adapter APIs
#3852

• test parameters for validating bids

{
  bidder: '<bidder name>',
  params: {
    // ...
  }
}

Be sure to test the integration with your adserver using the Hello World sample page.

• contact email of the adapter’s maintainer
• official adapter submission

For any changes that affect user-facing APIs or example code documented on http://prebid.org, please provide:

• A link to a PR on the docs repo at https://github.com/prebid/prebid.github.io/

Other information

[jsnellbaker]

@msm0504 These changes look good from my perspective.

Could you add a (or some) unit test(s) to the new utils function?

Thanks!

[msm0504]

@jsnellbaker I've added unit tests for the utils function, but now tests for widespaceBidAdapter are failing on CircleCI. Tests pass when I run locally. Do you know what would cause this?

[jsnellbaker]

@msm0504 I think that test run was just a fluke. It's passing now on the subsequent test run.

LGTM

[robertrmartinez]

Nice!

Love the new deepSetValue util being added. Thanks!

[bretg]

Docs PR prebid/prebid.github.io#1367

[msm0504]

@robertrmartinez Thank @idettman. He wrote the util. I copied it for my PR.

Also, I'm going to post in the slack channel about using a library for these types of utils. I asked about lodash previously, but that's too large. I found the clone function in Prebid is pulled from just (https://anguscroll.com/just/). I'm hoping we can use that for other functions, too.