Add support for Hot Soup Processor

## Language name
Hot Soup Processor ([OpenHSP](https://github.com/onitama/OpenHSP))

## URL of example repository
https://github.com/Ruin0x11/ElonaPlusCustom-GX/tree/work/2.05-custom-gx

## URL of syntax highlighting grammar
https://github.com/vain0x/hsp3-ginger/tree/main/hsp3-vscode-syntax

## Most popular extensions
`.hsp`
`.as`
`.hs`

## Detected language
AngelScript (`.as`)

Review the linked OpenHSP example repository and the hsp3-ginger VS Code syntax grammar first. Then trace Linguist’s language-detection and syntax-highlighting entry points to determine how .hsp, .as, and .hs should be recognized without misclassifying AngelScript. Done means Hot Soup Processor is detected correctly and its syntax highlighting is supported.

Written by the indexing model from the issue text.