feat: added support for context cancellation to engine (#5096)

* feat: added support for context cancellation to engine

* misc

* feat: added contexts everywhere

* misc

* misc

* use granular http timeouts and increase http timeout to 30s using multiplier

* track response header timeout in mhe

* update responseHeaderTimeout to 5sec

* skip failing windows test

---------

Co-authored-by: Tarun Koyalwar <tarun@projectdiscovery.io>

pkg/tmplexec/flow/flow_executor.go

@@ -174,6 +174,12 @@ func (f *FlowExecutor) Compile() error {
 
 // ExecuteWithResults executes the flow and returns results
 func (f *FlowExecutor) ExecuteWithResults(ctx *scan.ScanContext) error {
+	select {
+	case <-ctx.Context().Done():
+		return ctx.Context().Err()
+	default:
+	}
+
 	f.ctx.Input = ctx.Input
 	// -----Load all types of variables-----
 	// add all input args to template context