performance: move log group filters to invoker

[dasfmi]

Moved the env variables to invoker, and used the ResourceProperties instead to get these values. This avoids modifying the Lambda environment variables, which used to force a Lambda function update by CloudFormation and prolongs the whole process.

context:

Another thing, just as a suggestion from a performance perspective: it might be beneficial to provide CloudWatchLogGroupsNames, CloudWatchLogGroupsPrefix, and CloudWatchLogGroupsPattern to the Custom Resource instead of passing them to Lambda function as environment variables. CloudFormation includes the Custom Resource properties in the payload sent to Lambda, so you can read them from the event (from the ResourceProperties property) in the code. This avoids modifying the Lambda environment variables, which forces a Lambda function update by CloudFormation and prolongs the whole process.

This PR also changes the parameters to remove the s in Groups to be consistent, e.g: CloudWatchLogGroupNames instead of CloudWatchLogGroupsNames

[a-khaledf]

LGTM