XYB-jpeg: jpeg-specific clustering and more progression. (#1875)
XYB-jpeg: jpeg-specific clustering and more progression. (#1875)

Benchmark before:
```
Encoding            kPixels    Bytes          BPP  E MP/s  D MP/s     Max norm        pnorm       BPP*pnorm   Bugs
------------------------------------------------------------------------------------------------------------------
jpeg:libjxl:d1.0      13270  3197015    1.9272988   5.469  29.993   2.19093180   0.70477101  1.358304300765      0
```

Benchmark after:
```
Encoding            kPixels    Bytes          BPP  E MP/s  D MP/s     Max norm        pnorm       BPP*pnorm   Bugs
------------------------------------------------------------------------------------------------------------------
jpeg:libjxl:d1.0      13270  3163678    1.9072018   4.031  25.939   2.19093180   0.70477101  1.344140529099      0
```
libjxl/libjxl,libjxl/libjxl,libjxl/libjxl,libjxl/libjxl,libjxl/libjxl,libjxl/libjxl,libjxl/libjxl,libjxl/libjxl