`BiSignal` is not listed correctly in `clash-manifest.json`

[alex-mckenna]

BiSignalIn / BiSignalOut are used in clash to provide inout ports to an entity. In the manifest these should be listed as a single port with an inout direction. However, currently the BiSignalIn is listed as an in port (without it's domain) and the BiSignalOut is not listed at all.

[martijnbastiaan]

without it's domain

Related: #1711

[alex-mckenna]

#1844 does not solve the issue of not showing the domain, but this is caused by the same thing as #1711, so this issue can be closed now that inout ports are rendered.