JetBrains: Add minimal strategy to load file content

Created by: philipp-spiess

Part of #34368 (closed)

We need a way to load search match file contents. To be efficient, we also want to only load every file only once (otherwise scrolling though a list of multiple results in a single file would cause unnecessary loading indicators).

This data in combination with the matched line information can now be sent over to Java to render the preview dialog

Test plan

Manually verified the console output:

App preview:

• Web
• Storybook

Check out the client app preview documentation to learn more.