[Bug] [OpenAPI 3.1] Path parameter values cannot contain the unescaped characters /, ? or #

Compared to 3.0, path parameter values cannot contain the unescaped characters /, ? or #
For now, `/` and `#` are allowed.

[Playground](https://typespec.io/playground/?c=aW1wb3J0ICJAdHlwZXNwZWMvaHR0cCI7CtIZcmVzdCI7CgpAc2VydmljZSh7CiAgdGl0bGU6ICJXaWRnZXQgU8YbIiwKfSkKbmFtZXNwYWNlIERlbW%2FHGzsKCnVzaW5nIFR5cGVTcGVjLkh0dHA70BVSZXN0OwpAcm91dGUoImN1c3RvIy9tR2V0Iikgb3AgxRHEDyhhOiBzdHJpbmcpOiB2b2lkOwo%3D&e=%40typespec%2Fopenapi3&options=%7B%22linterRuleSet%22%3A%7B%22extends%22%3A%5B%22%40typespec%2Fhttp%2Fall%22%5D%7D%2C%22options%22%3A%7B%22%40typespec%2Fopenapi3%22%3A%7B%22openapi-versions%22%3A%5B%223.1.0%22%2C%223.0.0%22%5D%7D%7D%7D)