feat: remove dependency on oid4vc-core

[daniel-mader]

Description of change

Remove dependency on oid4vc-core crate. The traits oid4vc_core::{Sign, Subject, Verify} should be implemented in the application instead.

Links to any relevant issues

• Deprecate oid4vc_core.rs #12

How the change has been tested

n/a

Definition of Done 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

[nanderstabel]

Looks good, you can now also remove these commented-out dependencies in producer/Cargo.toml :) :

# anyhow = "1.0"
# async-trait = "0.1"
# base64 = "0.22"
# futures = "0.3"
identity_iota.workspace = true
identity_stronghold.workspace = true
iota-sdk.workspace = true
iota_stronghold = { version = "2.0" }
log = "0.4"
serde = "1.0"
# serde_json.workspace = true
# signature.workspace = true
url = "2.5"

[github-actions]

🎉 This issue has been resolved in version 1.0.0-beta.1 🎉

The release is available on GitHub release

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