fix: speed up cloud linter command

[bruuuuuuuce]

This command just speeds up the elasticache/getMetrics api calls. We need to refactor a bit how the limiter is working. We should be able to query DescribeDynamodbTables at a higher rate that we query the DescribeTimeToLive api. I spent a bit of time trying to configure separate rate limiters for the ddb api calls, but it was not behaving as expected. I think we might need to first describe all of the ddb tables, maybe have some heuristics around which tables are worth attempting to get a ttl off of, and then call those with a separate slower rate limiter

Before

After

[bruuuuuuuce]

I'm working on adding a heuristic around querying the time to live metric, which will supersede this pr

[bruuuuuuuce]

closing in favor of #307