Prevent percent-encoding on InstanceID

[Powerbyte7]

This PR fixes an issue with url encoding of InstanceID in URLs.

The VRChat API does not accept percent-encoded variants of InstanceID, specifically the characters ~(). This causes an error when attempting the following API call:

https://api.vrchat.cloud/api/1/instances/wrld_28aab3e4-953f-4c85-9223-ef29a0873a6e:31124%7Egroup%28grp_b2a19685-c53e-4c5a-9503-744a5373bf2c%29%7EgroupAccessType%28plus%29%7Eregion%28use%29/shortName

{"error":{"message":"\"malformed url\"","status_code":400,"waf_code":26497}}

When using the raw string without encoding, the API yields a 200 response as expected.

https://vrchat.com/api/1/instances/wrld_28aab3e4-953f-4c85-9223-ef29a0873a6e:31124~group(grp_b2a19685-c53e-4c5a-9503-744a5373bf2c)~groupAccessType(plus)~region(use)/shortName

The workaround I found for this, is to set the schema type to password instead of string. This skips the urlencode call inside of the SDK. The Rust template only does URL encoding for the string type, as is shown here. A bit ugly, but it works.

More testing is needed before merging this fix, as I have only tested generation of the Rust SDK.