Add technical information to AST

[ivanhofer]

Informations like file name, line number, start and end character position are needed in certain situations. The current AST has no such information attached.

This means that each plugin that parses files into an AST needs to provide that information. So parsing json as a simple JS object is no longer possible. A more sophisticated parser is needed.

This could speed up writing changes to disk because just a small part of a file needs to be altered instead of rewriting the full file. This would also keep the formatting of a file intact. If someone prefers 3 spaces instead of the 2 spaces used in the plugin, then it would keep the format and just replace a single JSON property.

Use-cases:

• language server for displaying lint issues inline: RFC @inlang/core/lint #351 (comment)
• keep file format intact
• faster writeToDisk functionality

[samuelstroschein]

Not to confuse with #357, see #351 (comment)

[samuelstroschein]

Outdated because no AST exists anymore