Fix binary parameter truncation at embedded NUL in PDO emulated prepares (CWE-626)

[jahnvi480]

pdo_sqlsrv_dbh_quote hex-encoded binary parameters but stopped at the first NUL byte, silently truncating data bound with SQLSRV_ENCODING_BINARY under emulated prepares. Encode the full length in both PHP version paths and add a regression test. (MSRC 125656)

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 85.80%. Comparing base (3341925) to head (1b84c85).

Additional details and impacted files

@@           Coverage Diff           @@
##              dev    #1675   +/-   ##
=======================================
  Coverage   85.80%   85.80%           
=======================================
  Files          23       23           
  Lines        7251     7251           
=======================================
  Hits         6222     6222           
  Misses       1029     1029           

Files with missing lines	Coverage Δ
source/pdo_sqlsrv/pdo_dbh.cpp	91.36% <100.00%> (ø)

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