cargo-risczero new: add --guest-name option

[SchmErik]

The guest name parameter is used as the name of the guest package
as well as method ID and ELF constants in the guest code. Therefore, this
parameter is required to be a valid rust identifier. If this is not set, the
cargo risczero new command will prompt the user to enter a guest name.
If no value is supplied by the command line parameter or the prompt, the
default value for this parameter will be "method".

closes: https://github.com/risc0/scratch/issues/102
closes: #470

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[it09]

Do users need to rename name = methods to name = project-name-methods in the methods/Cargo.toml and in host/Cargo.toml, rename methods = { path = "../methods" } to project-name-methods = { path = "../methods" }

[it09]

Do we need to add serde::{from_slice, to_vec} into host/scr/main.rs?

[SchmErik]

Do users need to rename name = methods to name = project-name-methods in the methods/Cargo.toml and in host/Cargo.toml, rename methods = { path = "../methods" } to project-name-methods = { path = "../methods" }

So there's a guest crate within the methods crate and this renames the guest so there's no need to change the methods

[SchmErik]

Do we need to add serde::{from_slice, to_vec} into host/scr/main.rs?

no, the ExecutorEnvBuilder::write()calls to_vec so that should be taken care of... I think we need from_slice but the example doesn't use it at this time.. we expect the user to add code like this to deserialize the journal

[flaub]

I'm working on a PR to remove the need for from_slice.