Add chunking functionality same as A1111

[E2GO]

Request on adding same functionality as A1111 have for chunking prompt with BREAK word.

Description from A1111: BREAK keyword. Adding a BREAK keyword (must be uppercase) fills the current chunks with padding characters. Adding more text after BREAK text will start a new chunk.

Prompts could look like this with this feature: 1girl, city, indoors, street BREAK expressions BREAK gray hair, long hair, blue eyes, purple and golden suite, hair ornaments, geta, BREAK (dark light:1.2), (hyper extreme detailed), (masterpeace:0.5), (hyper extreme), (photorealistic), game cg, illustration, novel illustration, beautiful lighting, light from the front (good hand, nice hands, perfect hands:1), standing, hand on hip