migrate to indy jaxrs plugin

[videnkz]

refer #1337
hello, useAnnotationValueForTransactionName returns false during the test. But when JaxRsTransactionNameInstrumentation construct useAnnotationValueForTransactionName mocked with true value:

            if (useAnnotationValueForTransactionName) {
                if (pathAnnotationValue != null) {
                    transactionName = pathAnnotationValue;
                }
            }

[apmmachine]

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• Build Cause: Started by user Felix Barnsteiner

• Start Time: 2021-04-14T10:13:43.631+0000

• Duration: 54 min 19 sec

• Commit: dce0ebc

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Passed	1984
Skipped	19
Total	2003

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Skipped	19
Total	2003

[felixbarny]

You'll have to use GlobalVariables for useAnnotationValueForTransactionName, as the JaxRsTransactionNameInstrumentation class is loaded twice: once from the system class loader and once from the IndyPluginClassLoader. The constructor will only be called for the class loaded by the system class loader.
The other class will use the initial value of false.

[videnkz]

GlobalVariables

Thanks

[videnkz]

@SylvainJuge , @felixbarny please review this PR
Thanks

[SylvainJuge]

There is an unexpected java.lang.IllegalStateException: Cannot resolve type description for co.elastic.apm.agent.httpclient.AbstractHttpClientInstrumentationTest in the tests, @felixbarny can I let you handle this ?