[ChunkCodecCore] BREAKING change to the resizing behavior in try_resize_decode!

[nhz2]

dst may now be longer than the returned number of bytes, even if dst was grown with resize!.

try_resize_decode! will now only grow dst, never shrink it.

If max_size is less than length(dst), instead of throwing an error, try_resize_decode! will now act as if max_size == length(dst).

Also added the grow_dst! helper function.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 93.96%. Comparing base (a348174) to head (9b6d723).

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #45      +/-   ##
==========================================
- Coverage   96.04%   93.96%   -2.08%     
==========================================
  Files           4       33      +29     
  Lines         177     1343    +1166     
==========================================
+ Hits          170     1262    +1092     
- Misses          7       81      +74     

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