New check 7162 CloudWatch log groups have 365 days retention @Obiakara

[Obiakara]

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[toniblyx]

Thanks @Obiakara, let me add some comments and change suggestions here:

• For the title probably "Check if CloudWatch Log Groups have a retention policy of 365 days" sounds more comprehensive.
• Resource type is: AwsLogsLogGroup
• Service name is: cloudwatch (I know it is logs but we are consolidating this type of checks in cloudwatch so far).
• Please, for future optional changes put 365 in a variable inside the function. Like LOG_GROUP_RETENTION_PERIOD_DAYS= in case somebody else needs to adapt it is will be easier. Then use that variable in the text messages as well.

Thanks!

[Obiakara]

Thanks @toniblyx for your feedback. I made the changes and commited again