feat: add benchmark for displaying all programs in PATH

Summary:
This is the first regression we've seen for `fd` vs. `find`.


```sh
$ PATH="/opt/homebrew/Cellar/findutils/4.10.0/libexec/gnubin/:$PATH" ./warm-cache-exe-paths.sh
Benchmark 1: FIND_PROG=find FIND_ARGS='-maxdepth 1 -executable -type f,l -printf %f\n' get_programs_in_path
  Time (mean ± σ):     142.0 ms ±   6.0 ms    [User: 32.7 ms, System: 72.0 ms]
  Range (min … max):   129.7 ms … 154.6 ms    20 runs

Benchmark 2: FIND_PROG='fd .' FIND_ARGS='--hidden --max-depth=1 --type=executable --follow --format {/} ' get_programs_in_path
  Time (mean ± σ):     272.1 ms ±   6.0 ms    [User: 88.8 ms, System: 142.1 ms]
  Range (min … max):   258.2 ms … 279.9 ms    10 runs

Summary
  FIND_PROG=find FIND_ARGS='-maxdepth 1 -executable -type f,l -printf %f\n' get_programs_in_path ran
    1.92 ± 0.09 times faster than FIND_PROG='fd .' FIND_ARGS='--hidden --max-depth=1 --type=executable --follow --format {/} ' get_programs_in_path
Both fd and find found the same 2943 results
```

warm-cache-exe-paths.sh

@@ -0,0 +1,42 @@
+#!/bin/bash
+
+source "prelude.sh"
+
+# extracted from https://github.com/vegerot/dotfiles/blob/a9a50230d808572173d3eeec057739d0fe8d4470/bin/fzf-menu by @vegerot
+get_programs_in_path() {
+  local find_prog
+  local find_args
+  if [[ -n "${FIND_PROG:-}" ]]; then
+    find_prog=$FIND_PROG
+    find_args=${FIND_ARGS:-}
+  elif find / -maxdepth 0 -executable &>/dev/null || command -v gfind &>/dev/null; then
+    # GNU find
+    find_prog="$(command -v gfind || echo find) -L"
+    find_args="-maxdepth 1 -executable -type f,l -printf %f\n"
+  elif command -v fd > /dev/null; then
+    find_prog="fd ."
+    find_args="--hidden --max-depth=1 --type=executable --follow --format {/}"
+  else
+    # BSD find
+    find_prog="find"
+    find_args="-maxdepth 1 -perm +111 -type f,l -exec basename {} ;"
+  fi
+
+  local pathDeduped=$(printf '%s\n' $PATH | tr ':' '\n' | uniq )
+  for p in $pathDeduped; do
+    $find_prog $p $find_args 2>/dev/null || true
+  done \
+    | awk '!x[$0]++'
+    # awk removes duplicates without sorting.  Thanks https://stackoverflow.com/a/11532197/6100005 \
+  }
+export -f get_programs_in_path
+
+
+COMMAND_FIND="FIND_PROG='find -L' FIND_ARGS='-maxdepth 1 -executable -type f,l -printf %f\n' get_programs_in_path"
+COMMAND_FD="FIND_PROG='fd .' FIND_ARGS='--hidden --max-depth=1 --type=executable --follow --format {/} ' get_programs_in_path"
+
+hyperfine --shell=bash --warmup "$WARMUP_COUNT" \
+    "$COMMAND_FIND" \
+    "$COMMAND_FD" \
+    --export-markdown results-warm-cache-no-pattern.md
+check_for_differences "false" "$COMMAND_FIND" "$COMMAND_FD"