reloadServiceFileParam() {
    const configurationInput = this.initialServerlessConfig
    if (_.isObject(configurationInput.provider)) {
      this.provider = configurationInput.provider
      if (this.provider.stage == null) this.provider.stage = 'dev'
    }
    if (configurationInput.package) {
      this.package = configurationInput.package
    }
    this.custom = configurationInput.custom
    this.resources = configurationInput.resources
    this.functions = configurationInput.functions || {}
    this.configValidationMode =
      configurationInput.configValidationMode || 'warn'
    this.layers = configurationInput.layers || {}
    this.outputs = configurationInput.outputs
  }
Reloads the Service from the initial serverless configuration.
This method is responsible for setting the provider, package, custom, resources,
functions, config validation mode, layers (if the provider is AWS), and outputs
based on the initial serverless configuration. If no stage is specified for the
provider, it defaults to 'dev'. If no functions or layers are specified, they
default to empty objects.

@throws {Error} If there's an error in loading the service file parameters.