perplexity : show more kl-divergence data (#16321)

Adds additional percentile data for displayed in the output of `llama-perplexity --kl-divergence`:
- Added 95 percentile (mirroring existing 5 percentile)
- Added 0.1 percentile (mirroring existing 99.9 percentile)

Author: ddh0

tools/perplexity/perplexity.cpp

@@ -1931,11 +1931,13 @@ static void kl_divergence(llama_context * ctx, const common_params & params) {
     LOG("Maximum KLD: %10.6f\n", kld_values.back());
     LOG("99.9%%   KLD: %10.6f\n", percentile(kld_values, 0.999f));
     LOG("99.0%%   KLD: %10.6f\n", percentile(kld_values, 0.990f));
+    LOG("95.0%%   KLD: %10.6f\n", percentile(kld_values, 0.950f));
     LOG("90.0%%   KLD: %10.6f\n", percentile(kld_values, 0.900f));
     LOG("Median  KLD: %10.6f\n", kld_median);
     LOG("10.0%%   KLD: %10.6f\n", percentile(kld_values, 0.100f));
     LOG(" 5.0%%   KLD: %10.6f\n", percentile(kld_values, 0.050f));
     LOG(" 1.0%%   KLD: %10.6f\n", percentile(kld_values, 0.010f));
+    LOG(" 0.1%%   KLD: %10.6f\n", percentile(kld_values, 0.001f));
     LOG("Minimum KLD: %10.6f\n", kld_values.front());
 
     LOG("\n");