Text edit example using raylib.

[karl-zylinski]

Example of how to use core/text/edit with raylib. Looks like below. Has moveable caret, selection, undo, copy paste etc. Depends on odin-lang/Odin#7274

Written by Claude, reviewed and tested by me.

Checklist before submitting:

• This example has been added to .github/workflows/check.yml (for automatic testing)
• This example compiles cleanly with flags -vet -strict-style -vet-tabs -disallow-do -warnings-as-errors
• This example the naming and style convention: https://github.com/odin-lang/examples/wiki/Naming-and-style-convention (exceptions can be made for ports of examples that need to match 1:1 to the original source).
• By submitting, I understand that this example is made available under these licenses: Public Domain and Odin's zlib license. Only for third-party dependencies are other licenses allowed.

[karl-zylinski]

Test will pass if odin-lang/Odin#7274 is merged.