AMP-Video-ima add support for AdsRenderingSettings

### Description

can AMP-Video-ima add support for AdsRenderingSettings , so as we can limit bitrate to e.g 1000, this is so that we try to limit "heavy ad intervention' taking place, as the SDK can choose ones over this rate with the default -1 (i think) setting.

Could help alot of people who basically have no clue how many ads are being blocked by HAI due to -1 setting choosing higher bitrates etc

### Alternatives Considered

can't, can't access this setting currently

### Additional Context

_No response_

Start by tracing the AMP-Video-ima integration and checking the AdsRenderingSettings API, especially how its bitrate setting is passed to the ads SDK. Done means AMP-Video-ima exposes support for configuring this setting and verifies that a bitrate such as 1000 can be applied without the default -1 behavior.

Written by the indexing model from the issue text.