feat: add instrumentation for AsyncHttpClient version 1.8

[steverao]

No description provided.

[laurit]

I believe that some code could be shared between 1.8 and 1.9 instrumentations.

[steverao]

I believe that some code could be shared between 1.8 and 1.9 instrumentations.

Yes, but the code isn't extensive. There are a few differences in AsyncHttpClientHttpAttributesGetter and HttpHeaderSetter between them. It seems that we can simply extract AsyncHandlerData and ResponseInstrumentation.
BTW, if we create a new module named async-http-client-common to contain common codes, but it isn't used by async-http-client-2.0, is it acceptable?

[laurit]

BTW, if we create a new module named async-http-client-common to contain common codes, but it isn't used by async-http-client-2.0, is it acceptable?

you could name the common module async-http-client-1-common

There are a few differences in AsyncHttpClientHttpAttributesGetter and HttpHeaderSetter between them.

You could pass a helper class to these that abstracts away the part that is different between async http client versions.

[otelbot-java-instrumentation]

🔧 The result from spotlessApply was committed to the PR branch.