feat: Add support for pprof in coder agent (#1985)

* feat: Allow USR1 signal to start pprof

cli/agent_windows.go

@@ -0,0 +1,12 @@
+package cli
+
+import (
+	"context"
+
+	"cdr.dev/slog"
+)
+
+// agentStartPPROFOnUSR1 is no-op on Windows (no SIGUSR1 signal).
+func agentStartPPROFOnUSR1(ctx context.Context, logger slog.Logger, pprofAddress string) (srvClose func()) {
+	return func() {}
+}