feat: initial support for register printing

examples/web/index.ts

examples/web/react/app.css

examples/web/react/app.tsx

examples/web/react/components/canvas/canvas.tsx

examples/web/react/components/index.ts

...es/web/react/components/keyboard-chip8/keyboard-chip8.tsx

examples/web/react/components/keyboard-gb/keyboard-gb.tsx

examples/web/react/components/registers-gb/registers-gb.css

examples/web/react/components/registers-gb/registers-gb.tsx

examples/web/react/components/tiles/tiles.css

examples/web/react/components/tiles/tiles.tsx

src/cpu.rs

src/gb.rs