Enable route_settings in default stage

[honglus]

Is your request related to a problem? Please describe.

route_settings are in main.tf but are commented out, Maybe it was due to a bug in AWS provider, But anyway I tested it worked with throttling_burst_limit and throttling_rate_limit with AWS v4.25.0
/~https://github.com/terraform-aws-modules/terraform-aws-apigateway-v2/blob/master/main.tf#L92
Simply uncomment the block won't work with reason below.

Describe the solution you'd like.

route_settings will override default_settings, So even I just want to set throttling_rate_limit on route "POST /test", I have to set the remaining variables to use default_route_settings values, otherwise it will be AWS default value not default_route_settings value. e.g detailed_metrics_enabled will become false.
Enable route_settings and add only the route with at least one of the options:
data_trace_enabled, logging_level, throttling_burst_limit, throttling_rate_limit, detailed_metrics_enabled is not null
set the remaining variables to use use default_route_settings values

[honglus]

pull request #80

[github-actions]

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[honglus]

fixed by #80

[github-actions]

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