ix: added buffer boundary checking to event decoder + improve exception handling in event distributor

[Aderiani]

…ion handling in event distributor

**Related Issue(s)	Event decoder crashes on packets shorter than expected #3789 DecodingException import scope causes secondary failures #3790
Has Unit Tests (y/n)	n
Documentation Included (y/n)	n

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Change Description

1. Event Parser Robustness (High Priority)
   File: fprime_gds/common/decoders/event_decoder.py
   Problem: Parser crashes on malformed/short packets
   Fix: Add buffer boundary checking
2. Exception Handling (Medium Priority)
   File: fprime_gds/common/distributor/distributor.py
   Problem: DecodingException import scope issues
   Fix: Proper exception handling
3. Cross-Platform Compatibility (Medium Priority)
   Files: Event decoders
   Problem: Poor handling of endianness/structure differences
   Fix: More robust parsing with fallbacks

Rationale

Fixes bugs Event decoder crashes on packets shorter than expected #3789 DecodingException import scope causes secondary failures #3790

Testing/Review Recommendations

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Future Work

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