DATA-47079: create a prebid test page and test the feature

[wi101]

To check the test page run these commands:

• gulp build-bundle-dev --modules=liveIntentIdSystem,liveIntentAnalyticsAdapter,userId,appnexusBidAdapter
• gulp serve --modules=liveIntentIdSystem,liveIntentAnalyticsAdapter,userId,appnexusBidAdapter
• open the page: http://localhost:9999/integrationExamples/gpt/liveIntentAnalyticsAdapterExample.html

Type of change

• Bugfix

• Feature

• New bidder adapter

• Updated 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

Other information