Feature-gate Resolver

[PhilippGackstatter]

Description of change

Feature gate the resolver in identity_iota, and add client extension traits to the prelude.

Links to any relevant issues

Follow up to #1000.

Type of change

Add an x to the boxes that are relevant to your changes.

• Bug fix (a non-breaking change which fixes an issue)
• Enhancement (a non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation Fix

How the change has been tested

cargo check

Change checklist

Add an x to the boxes that are relevant to your changes.

• I have followed the contribution guidelines for this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes

[cycraig]

Looks good to me but please take the PR out of draft mode so the CI runs.

I got an error in the Wasm bindings, which needed a cargo update to fix, since the Cargo.lock versions of future are conflicting. Not sure if that's just a local problem. Edit: the Wasm Cargo.lock is gitignored, unlike the Stronghold bindings one, so it should be fine.

$ cargo clippy
    Updating crates.io index
error: failed to select a version for `futures`.
    ... required by package `iota-client v2.0.0-beta.3`
    ... which satisfies dependency `iota-client = "^2.0.0-beta.3"` of package `identity_iota_core v0.6.0 (/home/craig/Desktop/work/identity.rs/identity_iota_core)`
    ... which satisfies path dependency `identity_iota_core` (locked to 0.6.0) of package `identity_iota v0.6.0 (/home/craig/Desktop/work/identity.rs/identity_iota)`
    ... which satisfies path dependency `identity_iota` (locked to 0.6.0) of package `identity_wasm v0.6.0 (/home/craig/Desktop/work/identity.rs/bindings/wasm)`
versions that meet the requirements `^0.3.24` are: 0.3.24

all possible versions conflict with previously selected packages.

  previously selected package `futures v0.3.21`
    ... which satisfies dependency `futures = "^0.3"` (locked to 0.3.21) of package `identity_iota_core v0.6.0 (/home/craig/Desktop/work/identity.rs/identity_iota_core)`
    ... which satisfies path dependency `identity_iota_core` (locked to 0.6.0) of package `identity_iota v0.6.0 (/home/craig/Desktop/work/identity.rs/identity_iota)`
    ... which satisfies path dependency `identity_iota` (locked to 0.6.0) of package `identity_wasm v0.6.0 (/home/craig/Desktop/work/identity.rs/bindings/wasm)`

failed to select a version for `futures` which could resolve this conflict

[PhilippGackstatter]

I got an error in the Wasm bindings, which needed a cargo update to fix, since the Cargo.lock versions of future are conflicting. Not sure if that's just a local problem.

I think since we don't commit the Cargo.lock it should be okay? I didn't have the error locally and we don't have a very restrictive version for futures selected in our crates (just version = "0.3") so I'm not sure where it could originate from.