fix(cli): fix panic when no paths are provided

[camc314]

We now print the following error if no paths are provided:

e.g.:

$ cargo run --bin=oxc_cli -- lint
    Finished dev [unoptimized + debuginfo] target(s) in 0.14s
     Running `target/debug/oxc_cli lint`
Error: want at least one path

Previously, it paniced as we tried to index into a zero length array:

e.g.:

$ cargo run --bin=oxc_cli -- lint
    Finished dev [unoptimized + debuginfo] target(s) in 1.33s
     Running `target/debug/oxc_cli lint`
thread 'main' panicked at 'index out of bounds: the len is 0 but the index is 0', crates/oxc_cli/src/walk.rs:61:51
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace

[codspeed-hq]

CodSpeed Performance Report

Merging #944 will not alter performance

_{⚠️ No base runs were found}

_{Falling back to comparing camc314:c/fix-cli-panic (3e94e67) with main (85b113d)}

Summary

✅ 18 untouched benchmarks