Add support for Cursors

[lovetodream]

closes #27

[codecov]

Codecov Report

Attention: Patch coverage is 95.10870% with 9 lines in your changes missing coverage. Please review.

Project coverage is 76.53%. Comparing base (d67c45e) to head (a8d0620).

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #29      +/-   ##
==========================================
+ Coverage   76.06%   76.53%   +0.46%     
==========================================
  Files         111      111              
  Lines       13084    13251     +167     
==========================================
+ Hits         9952    10141     +189     
+ Misses       3132     3110      -22     

Files	Coverage Δ
Sources/OracleNIO/Capabilities.swift	93.98% <100.00%> (+1.46%)	⬆️
...ources/OracleNIO/Connection/OracleConnection.swift	91.04% <100.00%> (+0.75%)	⬆️
Sources/OracleNIO/Data/Cursor.swift	67.85% <100.00%> (ø)
Sources/OracleNIO/Messages/DescribeInfo.swift	89.63% <100.00%> (+0.19%)	⬆️
Sources/OracleNIO/OracleRowStream.swift	58.06% <100.00%> (-0.34%)	⬇️
Tests/IntegrationTests/OracleNIOTests.swift	99.65% <100.00%> (+0.01%)	⬆️
...IOTests/Utils/ExtendedQueryContext+TestUtils.swift	100.00% <100.00%> (ø)
...onnectionStateMachine/ConnectionStateMachine.swift	70.41% <0.00%> (-0.08%)	⬇️
Sources/OracleNIO/OracleTask.swift	81.60% <94.11%> (+1.97%)	⬆️
...ectionStateMachine/ExtendedQueryStateMachine.swift	77.41% <85.71%> (+0.89%)	⬆️

... and 3 files with indirect coverage changes