test: add benchmarks for various components

Adds benchmarking tests to ensure the application remains low on resources.
Covers payload parsing, auth verification, IRC chat line formatting, and more.

cmd/parasocial/main_test.go

@@ -0,0 +1,7 @@
+package main
+
+import "testing"
+
+func BenchmarkMain(b *testing.B) {
+	// Not really useful for entire application start
+}