LiveIntent User ID Module: Eliminating live-connect NPM Dependency

[3link]

Allows to use the LiveIntent user ID module with an instance of LiveConnect v3 present on the page instead of inlining the LiveConnect NPM module into the user ID module as described here: prebid/Prebid.js#11541.

The goal is to support both standard/minimal mode as well as the external mode during the migration phase. Once all our customers have migrated away from using standard/minimal mode, we will deprecate this mode and delete the LiveConnect NPM module dependency from Prebid together with all the code that depends on it.

🏷 Type of documentation

• new bid adapter
• update bid adapter
• new feature
• text edit only (wording, typos)
• bugfix (code examples)
• new examples

📋 Checklist

• Related pull requests in prebid.js or server are linked -> Paste link in this list or reference it on the PR itself
• For new adapters check submitting your adapter docs

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[bretg]

@dgirardi - this looks ok to me. Can you please confirm the gulp build command they're suggesting here is going to work?

[bretg]

@deepthivenkat - please fix the linting error -- multiple blank lines