stat: shell-escape control chars in %N output (#9925)

[jamesarch]

Closes #9925.

Problem

GNU stat encodes control characters in file names using bash
$'\X' shell-escape sequences in the %N directive:

$ touch $'/tmp/test\nnewline'
$ /usr/bin/stat -c '{"name":"%N"}' $'/tmp/test\nnewline'
{"name":"'/tmp/test'$'\n''newline'"}

uutils was emitting the newline byte literally between single quotes,
producing invalid shell-quoted output and breaking JSON / log consumers
that parse the result:

{"name":"'/tmp/test
newline'"}

Fix

For the default %N quoting style (ShellEscapeAlways), delegate to
uucore's shell-escape implementation
(uucore::quoting_style::locale_aware_escape_name), which already
encodes control characters as $'\X' sequences. Same code path that
ls --quoting-style=shell-escape uses, so stat -c %N output is now
consistent with ls.

QUOTING_STYLE=locale and =shell keep their previous backslash-escape
behavior so that GNU's tests/stat/stat-fmt.sh (which asserts '\''
for a ' file under locale) still passes.

Cargo.toml: enables the quoting-style uucore feature for uu_stat.

Tests

Added:

• test_format_n_handles_newline — exact GNU output for newline.
• test_format_n_handles_tab — tab sanity check.

test_quoting_style_locale continues to pass unchanged.

$ cargo test --features 'stat' --test tests -- test_stat
test result: ok. 35 passed; 0 failed

GNU compatibility: tests/stat/stat-fmt.sh continues to pass.

🤖 Generated with Claude Code

[github-actions]

GNU testsuite comparison:

Skip an intermittent issue tests/date/date-locale-hour (fails in this run but passes in the 'main' branch)
Skipping an intermittent issue tests/cut/bounded-memory (passes in this run but fails in the 'main' branch)
Note: The gnu test tests/printf/printf-surprise is now being skipped but was previously passing.
Note: The gnu test tests/tail/tail-n0f is now being skipped but was previously passing.
Skip an intermittent issue tests/pr/bounded-memory (was skipped on 'main', now failing)