Update slack functions with new type

[WilliamBergamin]

Summary

This PR introduces the new slack type slack#/types/file_id and update the slack functions to use this new type.

Had to also modify he generation script to improve the robustness of the generated tests

testing

1. Add https://raw.githubusercontent.com/slackapi/deno-slack-sdk/type_file_id_with_builtins/src/ as the value of deno-slack-sdk/ in the import_map.json of a project
2. Build a workflow that uses the new feature example

import { DefineWorkflow, Schema } from "deno-slack-sdk/mod.ts";

const ImageWorkflow = DefineWorkflow({
  callback_id: "post_image",
  title: "Workflow to post an image",
  description: "A workflow that post an image in the channel it is invoked",
  input_parameters: {
    properties: {
      interactivity: {
        type: Schema.slack.types.interactivity
      },
      channel: {
        type: Schema.slack.types.channel_id,
      },
    },
    required: ["channel", "interactivity"],
  },
});

const getImageStep = ImageWorkflow.addStep(
  Schema.slack.functions.OpenForm,
  {
    title: "Submit this form",
    interactivity: ImageWorkflow.inputs.interactivity,
    fields:{
      elements: [{
        title: "Enter a file",
        name: "image",
        type: Schema.types.array,
        maxItems: 1,
        items: {
          type: Schema.slack.types.file_id,
        },
      }],
      required: ["image"],
    }
  },
);

ImageWorkflow.addStep(Schema.slack.functions.SendMessage, {
  channel_id: ImageWorkflow.inputs.channel,
  message: "cool image bro",
  files: getImageStep.outputs.fields.image
});

export default ImageWorkflow;

3. Everything should run as expected

Special notes

Ensure your app has the files:read scope, since this is required for the feature and logged error is cryptic

Requirements

• [x] I've read and understood the Contributing Guidelines and have done my best effort to follow them.
• [x] I've read and agree to the Code of Conduct.
• [x] I've ran deno task test after making the changes.

[codecov[bot]]

Codecov Report

Merging #237 (d3a96fc) into main (288a284) will increase coverage by 0.09%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #237      +/-   ##
==========================================
+ Coverage   97.97%   98.07%   +0.09%     
==========================================
  Files          58       58              
  Lines        2177     2280     +103     
  Branches      137      137              
==========================================
+ Hits         2133     2236     +103     
  Misses         42       42              
  Partials        2        2              

Files	Coverage Δ
src/dev_deps.ts	100.00% <100.00%> (ø)
src/schema/slack/functions/add_pin.ts	100.00% <100.00%> (ø)
...rc/schema/slack/functions/add_user_to_usergroup.ts	100.00% <100.00%> (ø)
src/schema/slack/functions/archive_channel.ts	100.00% <ø> (ø)
src/schema/slack/functions/create_channel.ts	100.00% <ø> (ø)
src/schema/slack/functions/create_usergroup.ts	100.00% <100.00%> (ø)
src/schema/slack/functions/delay.ts	100.00% <100.00%> (ø)
...c/schema/slack/functions/invite_user_to_channel.ts	100.00% <100.00%> (ø)
src/schema/slack/functions/mod.ts	100.00% <100.00%> (ø)
src/schema/slack/functions/open_form.ts	100.00% <100.00%> (ø)
... and 7 more

... and 5 files with indirect coverage changes

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