provider/aws: Add support for api_gateway_authorizer

[radeksimko]

Test plan

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

TF_ACC=1 go test ./builtin/providers/aws -v -run=AWSAPIGatewayAuthorizer -timeout 120m
=== RUN   TestAccAWSAPIGatewayAuthorizer_basic
--- PASS: TestAccAWSAPIGatewayAuthorizer_basic (39.36s)
PASS
ok      github.com/hashicorp/terraform/builtin/providers/aws    39.388s

[stack72]

This looks good :) Thanks @radeksimko !

[ghost]

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