[5.0][Events] More Finder event classes

[Fedik]

Summary of Changes

Missing classes for Finder

Affected events:

• onStartIndex
• onBeforeIndex
• onBuildIndex
• onFinderGarbageCollection

Currently the events are empty, in the future we can provide an Indexer and State instances with each event, instead of accessing them staticaly. Example $iState = Indexer::getState() may become $iState = $event->getState()

Testing Instructions

Use Smart search index

Actual result BEFORE applying this Pull Request

Works

Expected result AFTER applying this Pull Request

Works

Link to documentations

Please select:

• Documentation link for docs.joomla.org: https://docs.joomla.org/Plugin/Events#Finder
• No documentation changes for docs.joomla.org needed
• Pull Request link for manual.joomla.org: New Event classes Manual#177
• No documentation changes for manual.joomla.org needed

Reference:

• [5.0][Events] Finder event classes #41320

[HLeithner]

thanks @Hackwar can you check