[BUG] Python client generator doesn't handle schema clashes

[brendanator]

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?
• [Optional] Sponsorship to speed up the bug fix or feature request (example)

Description

The GitHub openapi spec contains a commit object which contains an inner commit object.

When I generate a client using the Python generator only the inner commit object is generated

openapi-generator version

$ docker run --rm openapitools/openapi-generator-cli:latest --version
openapi-generator-cli 7.9.0-SNAPSHOT
  commit : ca378b4
  built  : -999999999-01-01T00:00:00+18:00
  source : https://github.com/openapitools/openapi-generator
  docs   : https://openapi-generator.tech/

OpenAPI declaration file content or url

Here's the full GitHub openapi spec and here's the relevant snippet

      "commit": {
        "title": "Commit",
        "description": "Commit",
        "type": "object",
        "properties": {
          ...
          "commit": {
            "type": "object",
            "properties": {
              "url": {
                "type": "string",
                "format": "uri",
                "example": "https://api.github.com/repos/octocat/Hello-World/commits/6dcb09b5b57875f334f61aebed695e2e4193db5e"
              },
              "author": {
                "$ref": "#/components/schemas/nullable-git-user"
              },
              "committer": {
                "$ref": "#/components/schemas/nullable-git-user"
              },
              "message": {
                "type": "string",
                "example": "Fix all the bugs"
              },
              "comment_count": {
                "type": "integer",
                "example": 0
              },
              "tree": {
                "type": "object",
                "properties": {
                  "sha": {
                    "type": "string",
                    "example": "827efc6d56897b048c772eb4087f854f46256132"
                  },
                  "url": {
                    "type": "string",
                    "format": "uri",
                    "example": "https://api.github.com/repos/octocat/Hello-World/tree/827efc6d56897b048c772eb4087f854f46256132"
                  }
                },
                "required": [
                  "sha",
                  "url"
                ]
              },
              "verification": {
                "$ref": "#/components/schemas/verification"
              }
            },
            "required": [
              "author",
              "committer",
              "comment_count",
              "message",
              "tree",
              "url"
            ]
          },
          ...

Generation Details

docker run --rm -v /tmp:/local openapitools/openapi-generator-cli:latest generate \
  --input-spec https://raw.githubusercontent.com/github/rest-api-description/main/descriptions/api.github.com/api.github.com.2022-11-28.json \
  --generator-name python \
  --output /local

Steps to reproduce

1. Run the docker generation command above
2. cat /tmp/openapi_client/models/commit.py
3. See that it is the inner commit object and the outer one does not exist

Suggest a fix

I suggest including the outer name in the name of nested objects - in this case the inner class would be named CommitCommit