Add possibility to change default request params

[k1rd3rf]

Useful when overriding the http client, and you want to make sure the request params are set.

Can be set to "" in order to not make it optional.

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[!NOTE] Introduce defaultRequestParams config/CLI flag to set the default request params in generated APIs, applied in templates and covered by tests.

• Config & CLI
  • Add default-request-params CLI arg and plumb to generateApi as defaultRequestParams.
  • Set default in CodeGenConfig (defaultRequestParams = "{}").
• Templates
  • Use config.defaultRequestParams for request config arg default in templates/default/procedure-call.ejs and templates/modular/procedure-call.ejs.
• Types
  • Extend GenerateApiConfiguration.config with defaultRequestParams: string.
• Tests
  • Add tests/spec/defaultRequestParams/* with snapshots for basic, modular, and empty default cases.

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