A Polygon Erigon node with a local consensus client

[mriccobene]

In order to run a Polygon Erigon node with a local consensus client, e.g. in an ephemeral network like the one created by Kurtosis, I have to install and configure a Heimdall client. I could also try Astrid, although it is still under development.

It would be useful to specify, perhaps in the Erigon documentation, how to make the following two configurations:

1. Erigon with local Heimdall
2. Erigon with Astrid