Support RFC 6570 for Resource Templates

[SamMorrowDrums]

According to the Model Context Protocol Specification, the uriTemplate should support RFC 6570.

{
  uriTemplate: string;   // URI template following RFC 6570
  name: string;          // Human-readable name for this type
  description?: string;  // Optional description
  mimeType?: string;     // Optional MIME type for all matching resources
}

The currently load-baring regex is not able to support the spec, and also the params are not passed to the handler, which in some dynamic scenarios can be very useful.