Fixes a bug that allowed NegativeArraySizeException to be thrown from IonReader.newBytes().

[tgregg]

Issue #, if available:
FasterXML/jackson-dataformats-binary#469

Description of changes:
A value's end index is calculated by adding the reader's current index in the buffer (peekIndex) to the value's declared length. Before this fix, the validation for a too-large end index (endIndex < 0) happened too early (before peekIndex had been added). This allowed for the possibility that a very large but valid value length could overflow when peekIndex was added, as exercised by the added test. When this happened for blob/clob values, IonReader.byteSize() would return a negative number, causing NegativeArraySizeException to be thrown from IonReader.newBytes(). After the fix, the reader throws IonException upon encountering the overflowing end index.

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[codecov]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (3c1b6b1) 67.23% compared to head (cea1ee8) 67.24%.
Report is 3 commits behind head on master.

❗ Current head cea1ee8 differs from pull request most recent head 5305a78. Consider uploading reports for the commit 5305a78 to get more accurate results

Files	Patch %	Lines
...main/java/com/amazon/ion/impl/IonCursorBinary.java	88.88%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #705      +/-   ##
============================================
+ Coverage     67.23%   67.24%   +0.01%     
- Complexity     5484     5486       +2     
============================================
  Files           159      159              
  Lines         23025    23027       +2     
  Branches       4126     4126              
============================================
+ Hits          15481    15485       +4     
  Misses         6262     6262              
+ Partials       1282     1280       -2     

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