Use HTTP method table from ESP-IDF's nghttp (#4900)

Fixes: #4884

* Use HTTP method table from ESP-IDF's nghttp
* Parse methods using IDF's HTTP method list
* Make example's loops to allow the CPU to switch tasks

libraries/WebServer/examples/AdvancedWebServer/AdvancedWebServer.ino

@@ -125,6 +125,7 @@ void setup(void) {
 
 void loop(void) {
   server.handleClient();
+  delay(2);//allow the cpu to switch to other tasks
 }
 
 void drawGraph() {

libraries/WebServer/examples/FSBrowser/FSBrowser.ino

@@ -300,4 +300,5 @@ void setup(void) {
 
 void loop(void) {
   server.handleClient();
+  delay(2);//allow the cpu to switch to other tasks
 }

libraries/WebServer/examples/HelloServer/HelloServer.ino

@@ -70,4 +70,5 @@ void setup(void) {
 
 void loop(void) {
   server.handleClient();
+  delay(2);//allow the cpu to switch to other tasks
 }

libraries/WebServer/examples/HttpAdvancedAuth/HttpAdvancedAuth.ino

@@ -56,4 +56,5 @@ void setup() {
 void loop() {
   ArduinoOTA.handle();
   server.handleClient();
+  delay(2);//allow the cpu to switch to other tasks
 }

libraries/WebServer/examples/HttpBasicAuth/HttpBasicAuth.ino

@@ -38,4 +38,5 @@ void setup() {
 void loop() {
   ArduinoOTA.handle();
   server.handleClient();
+  delay(2);//allow the cpu to switch to other tasks
 }

libraries/WebServer/examples/PathArgServer/PathArgServer.ino

@@ -53,4 +53,5 @@ void setup(void) {
 
 void loop(void) {
   server.handleClient();
+  delay(2);//allow the cpu to switch to other tasks
 }

libraries/WebServer/examples/SDWebServer/SDWebServer.ino

@@ -310,4 +310,5 @@ void setup(void) {
 
 void loop(void) {
   server.handleClient();
+  delay(2);//allow the cpu to switch to other tasks
 }

libraries/WebServer/examples/SimpleAuthentification/SimpleAuthentification.ino

@@ -129,4 +129,5 @@ void setup(void) {
 
 void loop(void) {
   server.handleClient();
+  delay(2);//allow the cpu to switch to other tasks
 }

libraries/WebServer/examples/WebUpdate/WebUpdate.ino

@@ -65,5 +65,5 @@ void setup(void) {
 
 void loop(void) {
   server.handleClient();
-  delay(1);
+  delay(2);//allow the cpu to switch to other tasks
 }