HttpAsyncClientInstrumentation (httpasyncclient-4.x-plugin 7.0.0 API)

```
public class HttpAsyncClientInstrumentation
extends ClassInstanceMethodsEnhancePluginDefine
```
HttpAsyncClientInstrumentation indicates that the execute method in both org.apache.http.impl.nio.client.MinimalHttpAsyncClient#execute(HttpAsyncRequestProducer, HttpAsyncResponseConsumer, HttpContext, FutureCallback) and InternalHttpAsyncClient#execute(HttpAsyncRequestProducer, HttpAsyncResponseConsumer, HttpContext, FutureCallback) can be instrumented for single request.pipeline is not support now for some complex situation.this is run in main thread.

Field Summary
- Fields inherited from class org.apache.skywalking.apm.agent.core.plugin.interceptor.enhance.ClassEnhancePluginDefine
  CONTEXT_ATTR_NAME

Constructors
Constructor and Description
`HttpAsyncClientInstrumentation()`

All Methods Instance Methods Concrete Methods
Modifier and Type	Method and Description
`protected ClassMatch`	`enhanceClass()`
`ConstructorInterceptPoint[]`	`getConstructorsInterceptPoints()`
`InstanceMethodsInterceptPoint[]`	`getInstanceMethodsInterceptPoints()`

Methods inherited from class org.apache.skywalking.apm.agent.core.plugin.interceptor.enhance.ClassInstanceMethodsEnhancePluginDefine
getStaticMethodsInterceptPoints

Methods inherited from class org.apache.skywalking.apm.agent.core.plugin.interceptor.enhance.ClassEnhancePluginDefine
enhance

Methods inherited from class org.apache.skywalking.apm.agent.core.plugin.AbstractClassEnhancePluginDefine
define, isBootstrapInstrumentation, witnessClasses

Class HttpAsyncClientInstrumentation