Cargo.toml: toml crate is in [dependencies] but is only used in off-chain config parsing

[Haroldwonder]

Problem

The toml crate is listed in [dependencies] and is pulled into the WASM build. The toml crate requires std and will fail to compile for no-std WASM targets. It should only be available for off-chain tooling.

Location

Cargo.toml

Fix

Move toml to a std-gated optional dependency or to [dev-dependencies] if it is only used in tests and examples.

[daree-dev]

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