Custom prebidMobilePluginRenderer support

[jangirtony2009]

Describe the bug
The current renderer design in the Prebid SDK faces the following challenges:

1. OS does not seem to support sending custom data in the bid request. However, the following method exists:
   private PluginRenderer map(PrebidMobilePluginRenderer prebidMobilePluginRenderer) { PluginRenderer pluginRenderer = new PluginRenderer(); pluginRenderer.setName(prebidMobilePluginRenderer.getName()); pluginRenderer.setVersion(prebidMobilePluginRenderer.getVersion()); pluginRenderer.setData(prebidMobilePluginRenderer.getData()); return pluginRenderer; }
2. Is there a way to leverage this or another method to enable sending custom data in iOS bid requests?
   iOS appears to lack support for interstitial ads in the Prebid custom renderer. Are there plans to introduce this functionality, or is there a recommended approach for adding interstitial ad support?
   The current issue with interstitials lies in the InterstitialController. Specifically:
   The variable adViewManager (var adViewManager: PBMAdViewManager?) needs to be made public. Alternatively, should the PBMAdViewDelegate be implemented and honored by the custom renderer?
   Additionally, there is no way to receive a callback for showInterstitialAd in the customAdapter.Could you clarify or suggest the best approach to address these challenges?
3. The renderer maintains only a single object, which causes conflicts when multiple banner or interstitial objects are created, leading to overwriting.
4. The existing PrebidMobilePluginRenderer is not aligned with the complete implementation of the interstitial. It has no support for the show, isReady.

To Reproduce
Steps to reproduce the behavior:
Try to create a new CustomRendere

Expected behavior

1. Create CustomRenderer.
2. Make a adRequest. The get data object is not getting called.
3. when it call the CustomRenderer for interstitial. There is no way to pass the delegate.

Please take a look into the doc.

~557058afcfd484c4054dca9577f63850333f87-Proposed Design Document- Renderer Changes for Prebid SDK-281124-063952.pdf