Replace subspace-runtime with subspace-fake-runtime-api

[dastansam]

companion PR autonomys/subspace#2735

Before:

Building [===========>            ] 708/1336:

Now:

 Building [=====================> ] 1257/1268

[nazar-pc]

Pushed commit that removes genesis config usage, please rebase and squash once upstream PR is updated

[nazar-pc]

BTW this PR should proably be updated once upstream PR is merged, so we have commit from main here. I understand why you did it the way you did though.

[dastansam]

Pushed commit that removes genesis config usage, please rebase and squash once upstream PR is updated

thanks, this is a lot better! couldn't think of using () 🤦

BTW this PR should proably be updated once upstream PR is merged, so we have commit from main here. I understand why you did it the way you did though.

yes, I would update the commit hash here once that PR was merged.

[nazar-pc]

thanks, this is a lot better! couldn't think of using () 🤦

That generic is meaningful for legacy API that is soon to be removed from Substrate. When decoding from JSON it is not involved in anything and makes no difference, hence () is fine there and we'll likely remove it in the next Substrate upgrade anyway once it is gone upstream (they promised to remove in March, but it was still in the codebase).

[nazar-pc]

The impact of this should be even more than it seems because build step of subspace-runtime was compiling a lot of stuff, now all of it is gone. Thanks!