fix: fix spacing for casts and enum parse mappings

[latonz]

Remove NoramlizeWhitespace in unit tests to ensure correct formatting in unit tests.

Rel. #746 (comment)
Additional changes in formatting to #706:

• Enum parsing mapping: space in braces is removed: {} s when s.Equals(nameof(source.Value1), StringComparison.OrdinalIgnoreCase) => ... instead of { } s when s.Equals(nameof(source.Value1), StringComparison.OrdinalIgnoreCase) => ....

Changes to fix formatting introduced in #706:

• Enum parsing mapping: Adds a space between {} and s
• Dictionary mapping if only explicit interface implementation: indent variable declaration correctly
• Indent throw argument null exception throws correctly

[codecov]

Codecov Report

Merging #747 (ddb8b49) into main (4fa4163) will decrease coverage by 0.08%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #747      +/-   ##
==========================================
- Coverage   91.44%   91.36%   -0.08%     
==========================================
  Files         201      201              
  Lines        6651     6651              
  Branches      821      821              
==========================================
- Hits         6082     6077       -5     
- Misses        380      385       +5     
  Partials      189      189              

Files Changed	Coverage Δ
...tors/Mappings/Enums/EnumFromStringSwitchMapping.cs	100.00% <100.00%> (ø)
...arget/ForEachSetDictionaryExistingTargetMapping.cs	100.00% <100.00%> (ø)
...perly/Emit/Syntax/SyntaxFactoryHelper.Condition.cs	98.24% <100.00%> (ø)
...k.Mapperly/Emit/Syntax/SyntaxFactoryHelper.Null.cs	100.00% <100.00%> (ø)

... and 1 file with indirect coverage changes

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[github-actions]

🎉 This PR is included in version 3.2.0 🎉

The release is available on:

• GitHub release
• v3.2.0

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