Allow for cleaner output messages when forking origin ID is not valid

[AbhinavMir]

Component

Anvil

Describe the feature you would like

Currently, a bad command like anvil --fork-url https://mainnet.infura.io/v3/INVALID_CODE will result in

thread 'main' panicked at /home/runner/work/foundry/foundry/crates/anvil/src/config.rs:951:57:
Failed to get fork block number: DeserError { err: Error("expected value", line: 1, column: 1), text: "invalid project id\n" }
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
[1]    74091 IOT instruction (core dumped)  anvil --fork-url https://mainnet.infura.io/v3/INVALID_CODE
Time taken: 1 seconds         

A panic is rather hard for a non-Rust user to parse in a glance. A better message would probably be Fork error: Bad source URL or something of that kind.

Another side request, which I'm not sure of, is checking via regex is a URL during fork is valid (i.e of the form http://xyz.abc/)

Happy to take this up.

Additional context

No response

[zerosnacks]

Hi @AbhinavMir thanks for your suggestion,

I think a panic in this case is appropriate and the resulting error is highly dependent on the context

Marking as not planned