Appier: add support for aliases (prebid#5392)

* Add initial partial implementation for Appier bidder adapter.

* Use relative protocol for bidder API url.

* Handle server response for Appier adapter and add related unit tests.

* Support farm-specific prebid server and allow overriding the server with setConfig().

* Add doc for Appier bid adapter.

* Fix const correctness.

* Append requestId to the beacon image URL of Appier adapter to reduce the risks of being cached by proxy servers or browsers.

* Send bidderRequest.refererInfo to Appier bidder server.

* Remove the show beacon since now we generate it in the backend server.

* Only generate a show beacon url if it's not provided by the backend.

* Add version information for Appier adapter using semver (starts from 1.0.0).

* Add a new adapter for Appier bidder.

* Add a new adapter for Appier bidder.

* add appier analyticsAdapter skeleton.

* update initial working version.

* refactor and remove debug messages.

* fix config checking logic.

* implement bidAdjustment and add timeout before send event.

* unify cache operation into cacheManager to avoid direct key/value operation.

* Update server name.

* correct currency impl and message payload. remove unused debug messages.

* update var naming.

* rename creative vars. cleanup comments.

* add test cases for AnalyticsAdapter.

* update test specs file.

* remove spec from main branch.

* add unit tests for AnalyticsAdapter, #1 - Happy cases.

* refactor tests.

* update unit tests for AnalyticsAdapter.

* add tests for bid-adjusted, bid-timeout events

* fix bid adjustment test case.

* add nobid case in analytics unit test.

* add test case for delayed bids and prebidWon messages.

* Use logInfo and logError utilility functions instead of console.log() to print debug messages.

* handle timeout status message correctly.

* correct isTimeout setting logic and test cases.

* replace for...of by array.forEach for IE11

* apply auto formatter.

* refactor: extract timeout logic to a helper function

* tag analytic version with 0.1.0-beta for iCook release

* Re-implement the appier analytics adapter with a simpler design and correctly handle timeouts.

* Remove unused variables.

* Rename methods to improve consistency.

* Code cleanup: rename methods and avoid duplicated code.

* Fix wrong bid response data caused by non-deterministic event ordering of prebid.js.

* Send bid message immediately on auction end without delay.

* add withCredentials in ajax call to get client cookie.

* Fix broken unit test for appier analytic adapter.

* add prediction id support.

* update predictionId/configId format in tests.

* Init refined appier analytics testing

* hotfix: appier analytics support browserstack bug

* feat: add aliases

Co-authored-by: Hong Jen-Yee (PCMan) <pcman.hong@appier.com>
Co-authored-by: Yuan-Hung Huang <yuanhung.huang@appier.com>
Co-authored-by: kdchang <kd.chang@appier.com>
Co-authored-by: chih-ping-weng <chihping.weng@appier.com>

modules/appierBidAdapter.js

@@ -16,6 +16,7 @@ const BIDDER_API_ENDPOINT = '/v1/prebid/bid';
 
 export const spec = {
   code: 'appier',
+  aliases: ['appierBR', 'appierExt', 'appierGM'],
   supportedMediaTypes: SUPPORTED_AD_TYPES,
 
   /**