Support pipeDelimited + unexploded query parameter style

[czechboy0]

Support pipeDelimited + unexploded query parameter style.

Used by https://github.com/googlemaps/openapi-specification/blob/main/dist/google-maps-platform-openapi3.yml

[czechboy0]

Support spaceDelimited as well as part of this, they're very similar, with just the delimited being different.

[czechboy0]

Likely to be done together with #259.

[luomein]

The exploded query parameter style is not working in current version (0.3.4). It used to work properly in previous version (0.1.11)

example openapi.yaml

openapi: '3.0.3'
info:
  description:
  version: 2023.8.26
  title: example
  
servers:
  - url: https://example
  
paths:
  /example:
    get:
      operationId: example
      parameters:
      - name: LocationId
        required: false
        in: query
        style: form
        explode: false
        schema:
          type: array
          items:
            type: string

It now yields:
https://example/example?LocationId=1&LocationId=2

But it is expected to be:
https://example/example?LocationId=1,2

[czechboy0]

@luomein Please file bugs you discover as separate issues, I filed #377 on your behalf, let's move the discussion there.