New Data Source: aws_customer_gateway

[ripta]

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Fixes #5007

Release note for CHANGELOG:

**New Data Source:** `aws_customer_gateway`

Output from acceptance testing:

% make testacc TEST=./aws TESTARGS='-run=TestAccAWSCustomerGatewayDataSource*'
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./aws -v -parallel 20 -run=TestAccAWSCustomerGatewayDataSource* -timeout 120m
=== RUN   TestAccAWSCustomerGatewayDataSource_Filter
=== PAUSE TestAccAWSCustomerGatewayDataSource_Filter
=== RUN   TestAccAWSCustomerGatewayDataSource_ID
=== PAUSE TestAccAWSCustomerGatewayDataSource_ID
=== CONT  TestAccAWSCustomerGatewayDataSource_Filter
=== CONT  TestAccAWSCustomerGatewayDataSource_ID
--- PASS: TestAccAWSCustomerGatewayDataSource_ID (19.92s)
--- PASS: TestAccAWSCustomerGatewayDataSource_Filter (20.31s)
PASS
ok  	github.com/terraform-providers/terraform-provider-aws/aws	20.364s

[bflad]

Looks great, @ripta, thanks! 🚀

--- PASS: TestAccAWSCustomerGatewayDataSource_ID (23.08s)
--- PASS: TestAccAWSCustomerGatewayDataSource_Filter (23.56s)

[ghost]

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