call value_blob/value_text before value_bytes in remaining readers

[dxbjavid]

the same call-order issue fixed in callbackArgString (c3e96cd) still affects callbackArgBytes and the preupdate row reader, where sqlite3_value_bytes is invoked before sqlite3_value_blob/sqlite3_value_text. per the documented safe order the count should be read after the pointer, since an internal type or encoding conversion can otherwise leave the length and the buffer describing different representations and the following C.GoBytes over-reads. reordered both blob and text branches in each to fetch the pointer first, matching callbackArgString and the column reader.

[codecov-commenter]

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Codecov Report

❌ Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 51.63%. Comparing base (18cdded) to head (c93f6f6).
⚠️ Report is 100 commits behind head on master.

Files with missing lines	Patch %	Lines
callback.go	0.00%	2 Missing ⚠️
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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1410      +/-   ##
==========================================
+ Coverage   47.16%   51.63%   +4.47%     
==========================================
  Files          12       13       +1     
  Lines        1533     1867     +334     
==========================================
+ Hits          723      964     +241     
- Misses        669      742      +73     
- Partials      141      161      +20     

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