Issues with targetSDK 30 and Game Crash on New Versions

[Sam-1210]

Godot version: 3.3.1 AdMob Plugin version: 3.x, 4.x 5.x Issue description:

List of issues with 3.0.1:

• When Compiled with targetSDK 30, onAdFailedToLoad is called, targetSDK 30 is Google Play's new policy

  log: godot   : AdMob: onAdFailedToLoad. errorCode: 0
  log: godot   : AdMob: onAdFailedToLoad(int errorCode) - error code: 0

• When targetSDK is set to 29, everything works as expected

List of Issues with 4.0.x and 5.0.x (Same as #161 #148 )

• Game Crashes
• No Logs