Add metric logging for new delegated APIs

Add metric logging to:
 * Delegated cert selection
 * Delegated network logging access
 * Delegated silent package installation and removal

Bug: 122639711
Test: manual
Change-Id: I0655b742937b6413bc5c10474e4fd4559a8eaf92

• core/java/android/app/admin/DevicePolicyEventLogger.java[diff]
• core/proto/android/stats/devicepolicy/device_policy_enums.proto[diff]
• services/core/java/com/android/server/pm/PackageInstallerService.java[diff]
• services/core/java/com/android/server/pm/PackageInstallerSession.java[diff]
• services/devicepolicy/java/com/android/server/devicepolicy/DevicePolicyManagerService.java[diff]