feat: [AdsAdManager] Added support for AdBreak resource (#8409)

* feat: Added support for AdBreak resource
feat: Added support for PrivateAuction resource
feat: Added support for GeoTarget resource
feat: Added support for BandwidthGroup resource
feat: Added support for ProgrammaticBuyer
feat: Added support for OperatingSystem resource
feat: Added support for OperatingSystemVersion resource
feat: Added support for DeviceCategory resource
fix!: Added proto3 optional modifier to all primitive type fields
fix!: Moved Company enums to a separate file
fix!: Moved Report messages to a separate file
fix!: Changed canonical resource name format for CustomTargetingValue resource
feat!: New required field customTargetingKey added to CustomTargetingValue resource
docs: Updated documentation for multiple Report enums

PiperOrigin-RevId: 776579480

Source-Link: googleapis/googleapis@1bc5511

Source-Link: googleapis/googleapis-gen@bb5ea2e
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