Rework DIET mode

[Rot127]

Feature

• New architecture module
• Support for processor extension
• Add more instruction details (elaborated below)
• Binding support for: language
• Other (elaborated below)

Describe the feature you'd like

The DIET build of Capstone is untested and not done for the auto-sync architectures yet.
But besides that, it is also not well defined, how it behaves (see #1883)

We should define, how exactly the DIET mode works and very much consider to build it with a smaller libc like diet-libc

TODO

• [Tests] Add "DIET" CI job #2368
• Define what DIET builds provide and what not.
• Wrap more code in DIET guards for auto-sync builds.