Add event_bus_name to aws_cloudwatch_event_rule

[alexanderkalach]

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Relates #9330

Release note for CHANGELOG:

resource/aws_cloudwatch_event_rule: Add `event_bus_name`

Output from acceptance testing:

$ make testacc TEST=./aws TESTARGS='-run=TestAccAWSCloudWatchEventRule'
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./aws -v -count 1 -parallel 20 -run=TestAccAWSCloudWatchEventRule -timeout 120m
=== RUN   TestAccAWSCloudWatchEventRule_basic
=== PAUSE TestAccAWSCloudWatchEventRule_basic
=== RUN   TestAccAWSCloudWatchEventRule_role
=== PAUSE TestAccAWSCloudWatchEventRule_role
=== RUN   TestAccAWSCloudWatchEventRule_description
=== PAUSE TestAccAWSCloudWatchEventRule_description
=== RUN   TestAccAWSCloudWatchEventRule_pattern
=== PAUSE TestAccAWSCloudWatchEventRule_pattern
=== RUN   TestAccAWSCloudWatchEventRule_prefix
=== PAUSE TestAccAWSCloudWatchEventRule_prefix
=== RUN   TestAccAWSCloudWatchEventRule_tags
=== PAUSE TestAccAWSCloudWatchEventRule_tags
=== RUN   TestAccAWSCloudWatchEventRule_IsEnabled
=== PAUSE TestAccAWSCloudWatchEventRule_IsEnabled
=== CONT  TestAccAWSCloudWatchEventRule_basic
=== CONT  TestAccAWSCloudWatchEventRule_prefix
=== CONT  TestAccAWSCloudWatchEventRule_IsEnabled
=== CONT  TestAccAWSCloudWatchEventRule_tags
=== CONT  TestAccAWSCloudWatchEventRule_description
=== CONT  TestAccAWSCloudWatchEventRule_role
=== CONT  TestAccAWSCloudWatchEventRule_pattern
--- PASS: TestAccAWSCloudWatchEventRule_prefix (39.03s)
--- PASS: TestAccAWSCloudWatchEventRule_role (58.84s)
--- PASS: TestAccAWSCloudWatchEventRule_pattern (73.82s)
--- PASS: TestAccAWSCloudWatchEventRule_description (74.00s)
--- PASS: TestAccAWSCloudWatchEventRule_basic (76.13s)
--- PASS: TestAccAWSCloudWatchEventRule_tags (104.42s)
--- PASS: TestAccAWSCloudWatchEventRule_IsEnabled (106.44s)
PASS
ok  	github.com/terraform-providers/terraform-provider-aws/aws	106.479s
...

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