Added API.V1beta2.Resource to handle the path and request ID

[x-0o0]

Description of the change

  func generateMessage(_ model: String) -> GenerateMessageResource {
    - GenerateMessageResource(path: "\(path)/\(model):generateMessage")
    + GenerateMessageResource(path: "\(path)/\(model):\(Resource.generateMessage.rawValue)")
  }

  struct GenerateMessageResource {
    func post(_ body: GenerateMessageRequest? = nil) -> Request<GenerateMessageResponse> {
      - Request(path: path, method: .post, body: body, id: "generativelanguage.models.generateMessage")
      + Request(path: path, method: .post, body: body, id: Resource.generateMessage.id)
    }
  }

Motivation

I added an Enum called Resource in API.V1beta2 to manage frequently used string values.

Type of change

Other - Improvement

Checklist

• I have performed a self-review of my code.
• I have added detailed comments to my code where applicable.
• I have verified that my change does not break existing code.
• My PR is based on the latest changes of the main branch (if unsure, please run git pull --rebase upstream main).
• I am familiar with the Google Style Guide for the language I have coded in.
• I have read through the Contributing Guide and signed the Contributor License Agreement.

[peterfriese]

Thanks for the PR, @jaesung-0o0 !

Since we're using CreateAPI to generate the code for the API from the discovery document generativelanguage-v1beta3.json, all the strings you see are generated from the same machine-readable description file that is used to build the backend implementation.

Making any changes to this increases the risk of introducing typos, so I'd rather stick to the current process.