provider/aws: Add support for CloudWatch Log Metric Filter

[radeksimko]

TODO

• Basic CRUD functionality
• Documentation
• Acceptance test
• Add field validation per AWS API Docs
• Try out the new schema parameter MaxItems instead of len() function in Create()
• Be able to recover from filter deleted outside of Terraform
• Improve acceptance tests by adding checks of the actual cloudwatchlogs.MetricFilter type
• Mention link to filter and pattern syntax in docs
• Figure out if raising awserr.Error is the best way to deal with missing resource

Test plan

make testacc TEST=./builtin/providers/aws TESTARGS='-run=AWSCloudWatchLogMetricFilter'

TF_ACC=1 go test ./builtin/providers/aws -v -run=AWSCloudWatchLogMetricFilter -timeout 120m
=== RUN   TestAccAWSCloudWatchLogMetricFilter_basic
--- PASS: TestAccAWSCloudWatchLogMetricFilter_basic (17.98s)
PASS
ok      github.com/hashicorp/terraform/builtin/providers/aws    18.004s

[jen20]

Thanks @radeksimko! This LGTM!

[ghost]

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