[FEATURE] Update to match changes in Cloudwatch

[sander-bol]

Is your feature request related to a problem? Please describe.
AWS recently announced a number of changes to the Cloudwatch API. This handler still assumes the old limitations.

https://docs.aws.amazon.com/aws-sdk-php/v3/api/api-logs-2014-03-28.html#putlogevents

Describe the solution you'd like

• RPS_LIMIT: Has been removed "The quota of five requests per second per log stream has been removed. Instead, PutLogEvents actions are throttled based on a per-second per-account quota. You can request an increase to the per-second throttling quota by using the Service Quotas service."
• The whole sequence token thing can be deleted: The sequence token is now ignored in PutLogEvents actions. PutLogEvents actions are always accepted and never return InvalidSequenceTokenException or DataAlreadyAcceptedException even if the sequence token is not valid. You can use parallel PutLogEvents actions on the same log stream.

Describe alternatives you've considered
Forking the repo and making the changes there ;)

Additional context
Add any other context or screenshots about the feature request here.