Implement Performance Tracking (Fixes #130)

tests/spacefish_speed_test.fish

@@ -0,0 +1,11 @@
+#!/usr/bin/env fish
+function test_speed
+    fish -p trace_file -c "fish_prompt"
+    printf "20 Slowest Lines of Code\nTime    Sum     Command\n\n"
+    cat trace_file | sort -g | tail -n 20
+
+    hyperfine --warmup 10 'fish -c "fish_prompt"'
+end
+
+printf "Test"
+test_speed