Sip endpoints dont seem to work through this client

[jamesmcarthur115555]

Describe the bug
Sip endpoints for listing work but the creation ones throw an error

To Reproduce
Attempt to create a sip trunk or dispatch rule

{"code":"bad_route","msg":"no handler for path "/twirp/livekit.Egress/CreateSIPInboundTrunk"","meta":{"twirp_invalid_route":"POST /twirp/livekit.Egress/CreateSIPInboundTrunk"}}

Expected behavior
Creation of tunk or dispatch rule or validation error

Additional context
Add any other context about the problem here.

[jamesmcarthur115555]

` LivekitSip.SIPInboundTrunkInfo trunk = null;

    Response<SIPInboundTrunkInfo> tinfo = client.createSipInboundTrunk("testing", Arrays.asList("XXXXXXX"), opts).execute();
    if (tinfo.isSuccessful()) {

        System.out.println("GOOD??");
    } else {
        System.out.println(tinfo.isSuccessful());
        System.out.println(tinfo.errorBody().string());

    }
    `

[davidliu]

Fixed by #83