feat(cs-config, performance): add native_function_invocation rule

[yannchabed]

Why?

native_function_invocation rule adds leading \ before function invocation to speed up resolving.

refer to the rule documentation

strict parameter is set to false to keep the leading \in case it is not necessary. (Limits the amount of fixes)

⚠️ this rule is risky in case native function rules are overriden (implies a major version)

Example:

--- Original
+++ New
 <?php

 function baz($options)
 {
-    if (!array_key_exists("foo", $options)) {
+    if (!\array_key_exists("foo", $options)) {
         throw new \InvalidArgumentException();
     }

     return json_encode($options);
 }

Why setting strict parameter false ?

true value (default): The unnecessary leading \ are removed

--- Original
+++ New
 <?php

 function baz($options)
 {
-     return \json_encode($options);
+     return json_encode($options);

 }

false value: The unnecessary leading \ are kept. One can chosse to keep it or not.

--- Original
+++ New
 <?php

 function baz($options)
 {
     return \json_encode($options);
 }

TODO

• code is tested (locally)
• documentation is updated (if needed)

[Oliboy50]

🤞