[PR] Validate EMR_EXTCREATEPEN style entry count before allo cation [poi]

jmestwa-coder opened a new pull request, #1117:
URL: https://github.com/apache/poi/pull/1117

   ### Summary
   
   Validate the `EMR_EXTCREATEPEN` style entry count before allocating the dash pattern array.
   
   ### Changes
   
   * Add `HemfPicture.safelyAllocateCheck(numStyleEntries)` before allocating the dash pattern array.
   * Reuse the existing HEMF allocation validation mechanism already used in related parser paths.
   * Reject oversized style entry counts before attempting memory allocation.
   
   ### Why
   
   * `numStyleEntries` is read from EMF input and directly controls array allocation size.
   * A malformed record can request an excessively large allocation, leading to resource exhaustion or allocation failures.
   * This change ensures allocation limits are enforced consistently across HEMF record parsers.
   
   ### Impact
   
   * No behavior change for valid EMF files.
   * Oversized or malformed inputs now fail through the existing validation path instead of attempting allocation.
   * Aligns `EMR_EXTCREATEPEN` with the recent HEMF allocation-hardening updates.


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