Add syntax for Lova Language

[pacman-pcc]

Adds syntax highlighting configuration for Lova, a dynamic, transpiled programming language that compiles down to Bash.

• repo: https://github.com/pacman-pcc/Lova-lang
• File extension: .lova

The syntax config includes rules for:

• Keywords, conditional blocks (if, else, case, while, fdo, for, in, function, defer)
• Variable declarations (proc, procloc)
• I/O and checks (print, printn, sleep, is_file, is_dir, is_exist)
• Strings, numbers, operators, and comments (//)