Feature Request

In BR cmd user can pass in a rate-limit parameter, and this is passed down to TiKV in full backup to limit the upload rate. However the naming in full backup is limiter which is not very straightforward of what it is limiting, furthermore there is a resource limiter component being used as limiter as well, which is even more confusing.

I suggest to use rate_limiter for rate limiting and resource_limiter to the resource limiter in full backup path. In the sst importer the rate limiter is referred as speed_limiter, I guess it's fine as long as it's not causing confusion.