[BUG] swift-combine doesn't escape '#' in enum variables

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

Some of the enums values we have are full URLs, from which the swift5 generator correctly replaces # with Hash, however the swift-combine generator does not replace them.

openapi-generator version

7.2.0

OpenAPI declaration file content or url

openapi: 3.0.3
info:
  title: authentik
  version: 2023.10.4
  description: Making authentication simple.
  contact:
    email: hello@goauthentik.io
  license:
    name: MIT
    url: https://github.com/goauthentik/authentik/blob/main/LICENSE
paths: {}
components:
  schemas:
    DigestAlgorithmEnum:
      enum:
      - http://www.w3.org/2000/09/xmldsig#sha1
      - http://www.w3.org/2001/04/xmlenc#sha256
      - http://www.w3.org/2001/04/xmldsig-more#sha384
      - http://www.w3.org/2001/04/xmlenc#sha512
      type: string

Generation Details

docker run \
	-v $(pwd):/local \
	docker.io/openapitools/openapi-generator-cli:v7.2.0 generate \
	-i /local/schema.yml \
	-g swift-combine \
	-o /local \
	-c /local/config.yaml

Config being

templateDir: /local/templates/
additionalProperties:
  disallowAdditionalPropertiesIfNotPresent: false
  enumUnknownDefaultCase: true
  projectName: authentikClient
  podAuthors: authentik Team
  podHomepage: https://goauthentik.io/
  podSummary: authentik Swift API Client
files:
  README.mustache:
    templateType: SupportingFiles
    destinationFilename: README.md

Steps to reproduce

Run the command above with the supplied schema, which will generate this swift file:

public enum DigestAlgorithmEnum: String, Codable, CaseIterable {
    case _200009xmldsig#sha1 = "http://www.w3.org/2000/09/xmldsig#sha1"
    case _200104xmlenc#sha256 = "http://www.w3.org/2001/04/xmlenc#sha256"
    case _200104xmldsigMore#sha384 = "http://www.w3.org/2001/04/xmldsig-more#sha384"
    case _200104xmlenc#sha512 = "http://www.w3.org/2001/04/xmlenc#sha512"
    case unknownDefaultOpenApi = "unknown_default_open_api"
}

, which is not syntactically correct.

Related issues/PRs

Suggest a fix

This can be worked around with this enum mapping:

enumNameMappings:
  2000/09/xmldsig#sha1: _2000_09_xmldsig_sha1
  2001/04/xmldsig-more#sha384: _2001_04_xmldsig-more_sha384
  2001/04/xmlenc#sha256: _2001_04_xmlenc_sha256
  2001/04/xmlenc#sha512: _2001_04_xmlenc_sha512

however this shouldn't be required imo

Start by running the supplied Docker command with the provided OpenAPI schema and compare the generated swift-combine enum with the reported output. Done means the generated Swift enum cases are syntactically valid while preserving the original URL values, without requiring enumNameMappings.