Adding defensive checks to freed streams

[sirknightj]

Issue #, if available:

• N/A

What was changed?

• Fixed segmentation fault in JNI layer caused by dereferencing garbage pointer from failed ::kinesisVideoStreamGetStreamInfo() calls
• Added stream handle validation before frame operations
• Added integration tests for invalid stream state scenarios

Why was it changed?

• kinesisVideoStreamGetStreamInfo() returns an error when the stream is already freed, leaving pStreamInfo as a garbage value
• The code was unconditionally dereferencing this garbage pointer, which may cause a segmentation fault depending on what value is there. A core dump analysis identified this specific line as the crash source.
• Some validation exists to prevent frame operations on invalid/freed stream handles in the NativeKinesisVideoProducerStream.putFrame(), these changes add more checks.

How was it changed?

• Added status checking for kinesisVideoStreamGetStreamInfo() return value and proper exception throwing before pointer dereference
• Added precondition validation in putFrame() to ensure stream handle exists in the handle map
• Created PutFrameAtInvalidStatesIntegTest with various test scenarios covering frame submission after stream stop/free operations, and garbage stream handles

What testing was done for the changes?

• Ran the new tests locally
• Ran the DemoAppMain locally

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[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 50.06%. Comparing base (4593758) to head (4eaa5fd).

Additional details and impacted files

@@              Coverage Diff              @@
##             develop     #247      +/-   ##
=============================================
+ Coverage      49.83%   50.06%   +0.22%     
- Complexity       585      589       +4     
=============================================
  Files            106      106              
  Lines           4154     4155       +1     
  Branches         268      268              
=============================================
+ Hits            2070     2080      +10     
+ Misses          1936     1929       -7     
+ Partials         148      146       -2     

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