Allow extending of parameters (at least renaming them)

[kaznovac]

assume schema has this paths:

• /store
• /store/{store_id}
• /store/{store_id}/offers
• /store/{store_id}/offers/{offer_id}

and the {store_id} and {offer_id} are id's that are generated in the same manner (e.g. string($uuid))

it would be beneficial if pathId schema could be defined in the components/parameters

    "parameters": {
      "pathId": {
        "name": "id",
        "in": "path",
        "required": true,
        "schema": {
          "type": "string",
          "format": "uuid"
        },
        "example": "3fa85f64-5717-4562-b3fc-2c963f66afa6"
      }
    }

and then later reused for the parameter definition in the paths section

[hkosova]

Related (or duplicate of): #2026

[kaznovac]

Duplicate of #2026

thanks @hkosova this is subset of the mentioned issue

[kaznovac]

sibling to #2498