Suggest using --skip-validation CLI tool argument validation error

[christianhelle]

This pull request suggests to use the --skip-validation upon OpenApiUnsupportedSpecVersionException.

When OpenApiUnsupportedSpecVersionException is thrown, the user will be prompted to use the --skip-validation argument to bypass the validation process. In most cases, the code will still generate successfully, even though validation failed. However, this is no garantee

Additionally, the pull request includes some minor formatting improvements in the exception handling code.

The output of using a v3.1.0 spec is something like this:

Refitter v1.0.0.0
Support key: ptbddgt

Unsupported OpenAPI version: 3.1.0
Try using the --skip-validation argument.

Error: OpenAPI specification version '3.1.0' is not supported.
Exception: Microsoft.OpenApi.Readers.Exceptions.OpenApiUnsupportedSpecVersionException
Stack Trace:
   at Microsoft.OpenApi.Readers.ParsingContext.Parse(YamlDocument yamlDocument)
   at Microsoft.OpenApi.Readers.OpenApiYamlDocumentReader.ReadAsync(YamlDocument input, CancellationToken cancellationToken)
   at Microsoft.OpenApi.Readers.OpenApiTextReaderReader.ReadAsync(TextReader input, CancellationToken cancellationToken)
   at Microsoft.OpenApi.Readers.OpenApiStreamReader.ReadAsync(Stream input, CancellationToken cancellationToken)
   at Microsoft.OpenApi.Readers.OpenApiMultiFileReader.Read(String openApiFile, CancellationToken cancellationToken) in /home/runner/work/oasreader/oasreader/src/OasReader/OpenApiMultiFileReader.cs:line 21
   at Refitter.Validation.OpenApiValidator.Validate(String openApiFile) in C:\projects\christianhelle\refitter\src\Refitter\Validation\OpenApiValidator.cs:line 13
   at Refitter.GenerateCommand.ValidateOpenApiSpec(String openApiPath) in C:\projects\christianhelle\refitter\src\Refitter\GenerateCommand.cs:line 155
   at Refitter.GenerateCommand.ExecuteAsync(CommandContext context, Settings settings) in C:\projects\christianhelle\refitter\src\Refitter\GenerateCommand.cs:line 74

#############################################################################
#  Consider reporting the problem if you are unable to resolve it yourself  #
#  https://github.com/christianhelle/refitter/issues                        #
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[sonarcloud[bot]]

Quality Gate passed

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