Add output encoding options and bump version to 0.5.0

[Marc-André Moreau (mamoreau-devolutions)]

Summary

• add a global --output-encoding option with utf8-no-bom, utf8-bom, and utf8 values
• plumb output encoding through CLI query execution into file writes while keeping the default behavior as UTF-8 without BOM
• bump cirup and packaging metadata to 0.5.0 and document the new option

Details

• add CliOutputEncoding parsing and tests in cirup_cli
• add OutputEncoding support and BOM-aware byte generation in cirup_core::file
• expose the core output encoding type and route interactive writes through the new encoding-aware save path
• sync 0.5.0 across the Rust crates, NuGet packaging projects, sample project, and e2e script

Validation

• cargo fmt --all --check
• cargo clippy --workspace --all-targets
• cargo test --workspace
• manual smoke test of file-convert output bytes for RESX, JSON, and RESTEXT with utf8-no-bom vs utf8-bom

Notes

• cargo clippy completed successfully but emitted an environment-level warning while finalizing an incremental compilation directory under target