Spike: add InteliiJ plugins for macOS

[mostlikelee]

• timebox to 2pts
• add/link findings to Software inventory: add IntelliJ plugins #22463

[ksykulev]

Brain dump of what I found about this before organizing it for #22463

1. Path in which plugins are found

   • default: https://www.jetbrains.com/help/idea/directories-used-by-the-ide-to-store-settings-caches-plugins-and-logs.html#plugins-directory
   • custom: idea.plugins.path (this can be found in idea.properties, on mac for example /Applications/IntelliJ IDEA.app/Contents/bin)

2. Once path is determined each plugin in directory is either a directory or "bundled"

3. Loading each plugin is handled by https://github.com/JetBrains/intellij-community/blob/master/platform/core-impl/src/com/intellij/ide/plugins/PluginDescriptorLoader.kt#L255 loadDescriptorFromFileOrDir

4. There are two types of loading that occurs loadFromPluginDir or loadDescriptorFromJar

5. loadFromPluginDir -> intelligently searches through directory via putMoreLikelyPluginJarsFirst then invokes loadDescriptorFromJar.

6. loadDescriptorFromJar -> takes a jar and uses ImmutableZipFileDataLoader to load the plugin descriptor (usually located at /META-INF/plugin.xml). Jar files are pretty close to zip files, just slightly different headers

7. Jetbrains created custom code to open paths in jar files as an input stream. https://github.com/JetBrains/intellij-community/blob/master/platform/util/zip/src/com/intellij/util/lang/ImmutableZipFile.java#L126

8. Converting a path to an input stream is handled by
   https://github.com/JetBrains/intellij-community/blob/master/platform/util/zip/src/com/intellij/util/lang/Xxh3.java
   https://github.com/JetBrains/intellij-community/blob/master/platform/util/zip/src/com/intellij/util/lang/Ikv.java

9. Once an inputstream is fetched it is loaded via loadDescriptorFromStream

10. This finally creates an instance of IdeaPluginDescriptorImpl which has easy convenience methods for getting plugin version

[ksykulev]

Here is the "recommended" plugin jar structure >
https://plugins.jetbrains.com/docs/intellij/plugin-content.html#plugin-without-dependencies

Structure of configuration file >
https://plugins.jetbrains.com/docs/intellij/plugin-configuration-file.html

[fleet-release]

Plugin codes weave in,
Mac users find calm reprieve,
Fleet's reach expands, believe.

[ksykulev]

Added a lot of context and code samples into #20644. Please review that issue for more details.