Allow building payjoin crate with no default features #964
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Previously, the payjoin crate would fail to build if none of the features 'v1', 'v2', or 'directory' were enabled, due to an explicit compile_error! macro. This prevented the use of tools like cargo-all-features for comprehensive CI and dead code detection.
This change removes the compile_error! and replaces it with a doc-only module that is included when no features are enabled, making the crate a no-op in that configuration. The documentation and Cargo.toml are updated to clarify that at least one of the main features must be enabled for any functionality.
This enables better CI, linting, and future modularity, while preserving clear guidance for users and contributors.
Closes #921