Various optimization and API polishing (#51)

* feat: optimize auto options and method not allowed memory allocation

* feat: make EnableFullDuplex part of the ResponseWrite api.

* feat: improve .gitignore

* feat: move to rand/v2

* feat: prevent denial of service on adversary Xff of Fwd header line.

* feat: prevent denial of service on adversary Xff of Fwd header line.

* feat: improve ip strategy performance

* feat: improve test coverage for clientip strategy

* feat: improve test coverage for clientip strategy

* feat: better naming for system options

* feat: rename ClientIPStrategy to ClientIPResolver

* feat: rename ClientIPStrategy to ClientIPResolver

.gitignore

@@ -1,5 +1,9 @@
 .idea
-.prof
-.test
+*.prof
+*.test
+*.out
 go.work
-go.work.sum
+go.work.sum
+qodana.yaml
+new.txt
+old.txt

README.md

@@ -524,23 +524,23 @@ f := fox.New(
 )
 ````
 
-## Client IP Derivation
-The `WithClientIPStrategy` option allows you to set up strategies to resolve the client IP address based on your 
+## Resolving Client IP
+The `WithClientIPResolver` option allows you to set up strategies to resolve the client IP address based on your 
 use case and network topology. Accurately determining the client IP is hard, particularly in environments with proxies or 
 load balancers. For example, the leftmost IP in the `X-Forwarded-For` header is commonly used and is often regarded as the 
 "closest to the client" and "most real," but it can be easily spoofed. Therefore, you should absolutely avoid using it 
 for any security-related purposes, such as request throttling.
 
-The strategy used must be chosen and tuned for your network configuration. This should result in the strategy never returning 
+The resolver used must be chosen and tuned for your network configuration. This should result in a resolver never returning 
 an error and if it does, it should be treated as an application issue or a misconfiguration, rather than defaulting to an 
 untrustworthy IP.
 
-The sub-package `github.com/tigerwill90/fox/clientip` provides a set of best practices strategies that should cover most use cases.
+The sub-package `github.com/tigerwill90/fox/clientip` provides a set of best practices resolvers that should cover most use cases.
 
 ````go
 f := fox.New(
 	fox.DefaultOptions(),
-	fox.WithClientIPStrategy(
+	fox.WithClientIPResolver(
 		// We are behind one or many trusted proxies that have all private-space IP addresses.
 		clientip.NewRightmostNonPrivate(clientip.XForwardedForKey),
 	),
@@ -549,7 +549,7 @@ f := fox.New(
 f.MustHandle(http.MethodGet, "/foo/bar", func(c fox.Context) {
 	ipAddr, err := c.ClientIP()
 	if err != nil {
-		// If the current strategy is not able to derive the client IP, an error
+		// If the current resolver is not able to derive the client IP, an error
 		// will be returned rather than falling back on an untrustworthy IP. It
 		// should be treated as an application issue or a misconfiguration.
 		panic(err)
@@ -558,23 +558,24 @@ f.MustHandle(http.MethodGet, "/foo/bar", func(c fox.Context) {
 })
 ````
 
-It is also possible to create a chain with multiple strategies that attempt to derive the client IP, stopping when the first one succeeds.
+It is also possible to create a chain with multiple resolvers that attempt to derive the client IP, stopping when the first one succeeds.
 
 ````go
 f = fox.New(
 	fox.DefaultOptions(),
-	fox.WithClientIPStrategy(
+	fox.WithClientIPResolver(
 		// A common use for this is if a server is both directly connected to the
 		// internet and expecting a header to check.
 		clientip.NewChain(
-			clientip.NewLeftmostNonPrivate(clientip.ForwardedKey),
+			clientip.NewLeftmostNonPrivate(clientip.ForwardedKey, 10),
 			clientip.NewRemoteAddr(),
 		),
 	),
 )
 ````
 
-Note that there is no "sane" default strategy, so calling `Context.ClientIP` without a strategy configured will return an `ErrNoClientIPStrategy`.
+Note that there is no "sane" default strategy, so calling `Context.ClientIP` without a resolver configured will return 
+an `ErrNoClientIPResolver`.
 
 See this [blog post](https://adam-p.ca/blog/2022/03/x-forwarded-for/) for general guidance on choosing a strategy that fit your needs.
 ## Benchmark