Syntax interception for ref struct handling + formatting of (ReadOnly)Span<T>/(ReadOnly)Memory<T>

[kindermannhubert]

Resolves #317. Resolves #318.

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 66.51786% with 75 lines in your changes are missing coverage. Please review.

Project coverage is 77.4%. Comparing base (09748ae) to head (4d80331). Report is 21 commits behind head on main.

Files	Patch %	Lines
...ing/CustomObjectFormatters/IEnumerableFormatter.cs	43.0%	47 Missing and 6 partials :warning:
CSharpRepl.Services/RuntimeHelper.cs	57.8%	15 Missing and 1 partial :warning:
CSharpRepl.Services/Roslyn/RoslynServices.cs	94.7%	4 Missing :warning:
...harpRepl.Services/Roslyn/Scripting/ScriptRunner.cs	80.0%	0 Missing and 2 partials :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #353 +/- ## ======================================= + Coverage 77.3% 77.4% +0.1% ======================================= Files 83 84 +1 Lines 5607 5748 +141 Branches 736 749 +13 ======================================= + Hits 4335 4450 +115 - Misses 998 1020 +22 - Partials 274 278 +4 ```

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