[BUG][Kotlin] Path parameter values with slashes are not encoded correctly

Created by: segevfiner

Bug Report Checklist

Have you provided a full/minimal spec to reproduce the issue?
Have you validated the input using an OpenAPI validator (example)?
Have you tested with the latest master to confirm the issue still exists?
Have you searched for related issues/PRs?
What's the actual output vs expected output?
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Description

If you try to pass a path parameter value that has slashes in it, it won't be escaped correctly, leading to a 404.

openapi-generator version

5.4.0

OpenAPI declaration file content or url

openapi: 3.0.3
info:
  title: Test
  version: 0.1.0
paths:
  /repos/{repoPath}/documents:
    get:
      parameters:
        - schema:
            type: string
          in: path
          name: repoPath
          required: true
      responses:
        '200':
          description: OK
          content:
            application/json:
              schema:
                type: object
                properties: {}

Generation Details

{
  "$schema": "../node_modules/@openapitools/openapi-generator-cli/config.schema.json",
  "spaces": 2,
  "generator-cli": {
    "version": "5.4.0",
    "generators": {
      "kotlin": {
        "generatorName": "kotlin",
        "output": "kotlin",
        "inputSpec": "openapi.yaml",
        "additionalProperties": {
          "groupId": "test",
          "packageName": "test",
          "artifactVersion": "0.1.0"
        }
      }
    }
  }
}

Steps to reproduce

Use the generated client and pass a repoPath that has a slash in it.

Related issues/PRs

Suggest a fix

The problem is using addPathSegments which splits on / and doesn't escape it in the passed string. We will have to handle escaping by ourselves and use addEncodedPathSegments or store the path as a list of String to pass to multiple calls to addPathSegment.