feat: remove the necessity for amazonAdvertisingAPIClientId and amazonAdvertisingAPIScope on every api function call

[josh-fisher]

The autogenerated models contain request params for the API endpoints that most of the time take amazonAdvertisingAPIClientId and amazonAdvertisingAPIScope.

It would be great if this were somehow auto-populated by the API configuration that also accepts the same vars so that each API call does not have to have the same values applied, which can get quite verbose.

Current example code:

const result = await commonEligibilityClient.productEligibility({
  amazonAdvertisingAPIClientId: env.AMAZON_ADS_CLIENT_ID,
  amazonAdvertisingAPIScope: env.AMAZON_ADS_PROFILE_ID,
  productEligibilityRequest: product,
});

In our other library walmart-marketplace-api we attempted to solve this by destructuring these from a so-called defaultConfig.

const result = await commonEligibilityClient.productEligibility({
  ...defaultConfig,
  productEligibilityRequest: product,
});

However, this only partially solves the problem.

It would be great if we either somehow intercept these calls and populate the values or post-processed these files and add some sort of mixin or helper util for all the functions that require them.