Show Deserializaton Errors from Source Generator

[christianhelle]

This resolves #568 which relates to #534

This pull request includes several changes to the RefitterSourceGenerator.cs file to improve error handling and diagnostics during the code generation process. The most important changes include adding a diagnostics parameter to the TryDeserialize method and enhancing the error handling mechanism.

Improvements to error handling and diagnostics:

• src/Refitter.SourceGenerator/RefitterSourceGenerator.cs: Added a diagnostics parameter to the TryDeserialize method to collect diagnostics information. [1] [2]
• src/Refitter.SourceGenerator/RefitterSourceGenerator.cs: Enhanced the catch block in the TryDeserialize method to add a diagnostic message when deserialization fails.

Using the source generator with a .refitter file containing invalid JSON will result in an error message like this:

CSC : error REFITTER000: 
Unable to deserialize .refitter file: System.Text.Json.JsonException
The JSON object contains a trailing comma at the end which is not supported in this mode. 
Change the reader options. Path: $ | LineNumber: 8 | BytePositionInLine: 0.

Build failed with 1 error(s) in 2.3s

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.09%. Comparing base (ff76e06) to head (88dea30).
Report is 5 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #572      +/-   ##
==========================================
- Coverage   94.90%   92.09%   -2.82%     
==========================================
  Files          53       53              
  Lines        2612     2731     +119     
==========================================
+ Hits         2479     2515      +36     
- Misses         98      181      +83     
  Partials       35       35              

Flag	Coverage Δ
unittests	92.09% <ø> (-2.82%)	⬇️

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