feat(clique): allow shadowforking a clique network (#828)

[0xmountaintop]

cherry-pick 51c7eee

[semgrep-app]

Semgrep found 1 ssc-46663897-ab0c-04dc-126b-07fe2ce42fb2 finding:

• cmd/utils/flags.go
  • L2332 - Triage

Risk: Affected versions of golang.org/x/net, golang.org/x/net/http2, and net/http are vulnerable to Uncontrolled Resource Consumption. An attacker may cause an HTTP/2 endpoint to read arbitrary amounts of header data by sending an excessive number of CONTINUATION frames.

Fix: Upgrade this library to at least version 0.23.0 at go-ethereum/go.mod:146.

Reference(s): GHSA-4v7x-pqxf-cx7m, CVE-2023-45288

_{Ignore this finding from ssc-46663897-ab0c-04dc-126b-07fe2ce42fb2.}