feat: Enable route_settings in default stage

[honglus]

Description

Enable route_settings in default stage 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

Motivation and Context

78

Breaking Changes

No

How Has This Been Tested?

I have tested and deployed to my company AWS environment.

[honglus]

sorry, it is not easy for me to provision all resources in the example. Can you try 1) examples/complete-http is successful before the change. 2) try to pin AWS version to v4.25.0, which is the version I tested successfully for my company's resource.

[antonbabenko]

I am pretty sure that example worked before this PR. I will take a look into this PR during this week.

[antonbabenko]

This PR is included in version 2.2.0 :tada:

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