Convert ReaderPostRenderer and ReaderResourceVars to Kotlin (#21877)

* Rename .java to .kt

* Automated conversion of ReaderPostRenderer to Kotlin

* Renamed variables to Kotlin format

* Fixed most warnings

* Put params on separate lines

* Fixed comment wrapping in formatPostContentForWebView

* Converted beginRender to use a coroutine instead of a handler

* Make renderBuilder non-null

* Reformatted stringbuilder appends for readability

* Fixed line length warnings

* Fixed detekt warnings

* Rename .java to .kt

* Auto conversion of ReaderResourceVars

* Renamed ReaderResourceVars variables to Kotlin format

* Fixed MagicNumbers

* Use "as MaterialR" import to reduce line lengths

* Removed unused suppression

* Changed coroutine scope

* Changed postContent to a fun

* Removed unused renderedHtml variable

* Minor formatting changes

* Removed unused variables from ReaderResourceVars

* Replace for loops with forEach

Author: nbradbury

WordPress/src/main/java/org/wordpress/android/ui/reader/ReaderPostDetailFragment.kt

@@ -1614,7 +1614,7 @@ class ReaderPostDetailFragment : ViewPagerFragment(),
         readerProgressBar.visibility = View.VISIBLE
         renderer = ReaderPostRenderer(
             readerWebView,
-            viewModel.post,
+            post,
             readerCssProvider,
             getReadingPreferences()
         ).also {