Support for the RDP Multitransport Layer

[TODO comment in code](https://github.com/Devolutions/IronRDP/blob/f5a6ac7751dce6125f8faada03b288ab600035bd/crates/ironrdp-connector/src/connection.rs#L871).

> clientMultitransportChannelData (8 bytes): Optional [Client Multitransport Channel Data](https://learn.microsoft.com/en-us/openspecs/windows_protocols/ms-rdpbcgr/3801236b-b5ba-4b6e-bf0d-afbde1fe391c) structure (section 2.2.1.3.8). This field MUST NOT be included if the server did not advertise support for Extended Client Data Blocks by using the EXTENDED_CLIENT_DATA_SUPPORTED flag (0x00000001) as described in section 2.2.1.2.1.

[Source](https://learn.microsoft.com/en-us/openspecs/windows_protocols/ms-rdpbcgr/db6713ee-1c0e-4064-a3b3-0fac30b4037b)