Prepare for 0.4 release

[oruebel]

• Updated date and version in the CHANGELOG.md
• Updated version in CMakeLists.txt
• Fix isISO8601Date rejects valid ISO 8601 timestamps, including the form the NWB schema recommends #329
• Fix readIndexedCellValues returns wrong cells when stride is greater than 1 #334 Removed stride and block parameters from the new VectorIndex::readIndexedCellValues. The parameters were not being used yet and supporting this ully would require more runtime checks. We can add support for this later if it becomes necessary.
• Fix addRow silently drops values for unknown column names #331 Updated DynamicTable::addRows to fail when extra values for unknown columns are provided instead of silently ignoring extra values
• Fix Appending to a ragged column after reopening corrupts the table #330 Fix Ragged write leaves partial data when the index dtype is not uint32 #332 Load also VectorIndex columns in DynamicTable::loadConfiguredColumnsFromFile to support reopening a file with indexed columns and appending to it. Updated DynamicTable::addRows to support VectorIndex with different data types (previously it assumed uint32)

[codecov-commenter]

Codecov Report

❌ Patch coverage is 77.50000% with 9 lines in your changes missing coverage. Please review.
✅ Project coverage is 83.68%. Comparing base (6ad6333) to head (b7ef52f).

Files with missing lines	Patch %	Lines
src/nwb/hdmf/table/DynamicTable.cpp	75.67%	9 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #340      +/-   ##
==========================================
+ Coverage   83.66%   83.68%   +0.01%     
==========================================
  Files          71       71              
  Lines        4280     4296      +16     
  Branches      624      627       +3     
==========================================
+ Hits         3581     3595      +14     
- Misses        699      701       +2     

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