[topgen/ipgen] Support instantiating uniquified IPs

[Razer6]

ipgen supports uniquifiyng a generated IP via the module_instance_name parameter. This allows, for example, different IPs to be rendered based on a different input configuration. Ipgen then renders a new IP in a dedicated folder with a different uniquified module name.

open, however, is not yet capable of picking up such a uniquified IP and instantiate it. There are multiple issues causing that:

1. topgen performs a non-uniquified default-rendering of the IP to perform initial clock and reset checks. But because the IP is uniquified, the type would change and there is no relation to the original source IP definition.
2. The new IP type is kind of decoupled - It would need to be re-mapped to the original IP block, deal with CIPs, etc...

Probable more. /cc @matutem