add new step piperPublishNotifications (#652)

* add new step for notification publication

* add test cases

* add helper method

* correct import

* Update pom.xml

* add step to post section

* add step piperPublishNotifications

* move step to end of pipeline to gather all findings

* use handlePipelineStepErrors step

* use commonPipelineEnvironment

* correct reporting

* add configuration

* fix typos

* fix rule setup

* remove test scope

* add method to fetch full build log

* add methods for warnings-ng parser creation

* remove warnings plugin coding

* add default parser settings

* change parameter handling for parser creation

* adapt step

* fix parser creation

* use ParserConfig.contains

* use correct parameter name

* correct parser regex

* change issue creation

* use classloader

* fix typo

* Revert "fix typo"

This reverts commit 446a201ae4.

* Revert "use classloader"

This reverts commit a896487032.

* rename step to piperPublishWarnings

* extract recordIssuesSettings to defaults

* make addWarningsNGParser non-static

* remove node

* adjust test case

* add docs

* rename log file

* fix tests

* fix typos

* rename parameter

* add import for IOUtils

* check plugin activation

* add comment for class loader usage

documentation/docs/steps/piperPublishWarnings.md

@@ -0,0 +1,9 @@
+# ${docGenStepName}
+
+## ${docGenDescription}
+
+## ${docGenParameters}
+
+## ${docGenConfiguration}
+
+## ${docJenkinsPluginDependencies}