perf: reduce peak memory footprint during decoding large images

[sxyazi]

Before this patch:

❯ yazi --clear-cache

❯ /usr/bin/time -l ./old
       22.66 real        88.54 user         8.89 sys
          2953068544  maximum resident set size
                   0  average shared memory size
                   0  average unshared data size
                   0  average unshared stack size
              729991  page reclaims
                 544  page faults
                   0  swaps
                   0  block input operations
                   0  block output operations
                  27  messages sent
                  26  messages received
                  27  signals received
               45566  voluntary context switches
              355342  involuntary context switches
        859110694754  instructions retired
        249027752894  cycles elapsed
          2104009664  peak memory footprint

After this patch:

❯ yazi --clear-cache

❯ /usr/bin/time -l ./new
       20.98 real        89.38 user         8.32 sys
          2618294272  maximum resident set size
                   0  average shared memory size
                   0  average unshared data size
                   0  average unshared stack size
              687985  page reclaims
                 578  page faults
                   0  swaps
                   0  block input operations
                   0  block output operations
                  27  messages sent
                  27  messages received
                  27  signals received
               39077  voluntary context switches
              330604  involuntary context switches
        844330267015  instructions retired
        249565769264  cycles elapsed
          1593614592  peak memory footprint

A part of #373