Improve spell checker using codespell

* Configures automated spell checking with codespell
Adds GitHub workflows and configuration files for automated spell checking using `codespell`.

This includes:
- A workflow for checking pull requests and preventing new typos
- A workflow for automatically fixing typos in the main codebase
- Configuration files for `codespell` to ignore specific terms and file types
- Documentation on how to use and configure the spell checking workflows.

* Corrects minor spelling and grammar errors.

ApplicationLibCode/UnitTests/opm-summary-Test.cpp

@@ -311,14 +311,14 @@ TEST( OpmSummaryTests, OpmComputeSegmentTopology )
 
         RifReaderOpmRft reader( filePath );
 
-        auto adresses = reader.eclipseRftAddresses();
+        auto addresses = reader.eclipseRftAddresses();
 
         std::vector<float> segStartDepth;
         std::vector<float> segEndDepth;
         std::vector<float> segNumber;
 
         std::set<RifEclipseRftAddress> segmentAdresses;
-        for ( const auto& adr : adresses )
+        for ( const auto& adr : addresses )
         {
             if ( adr.wellLogChannel() == RifEclipseRftAddress::RftWellLogChannelType::SEGMENT_VALUES )
             {