Fix 181

[ardalis]

Fixes #181
Make ErrorList correlationId optional
Allow Result.Error to take a single error message string

[github-actions]

Package	Line Rate	Branch Rate	Complexity	Health
Ardalis.Result	82%	95%	109	✔
Summary	82% (193 / 234)	95% (36 / 38)	109	✔

[lloydkevin]

Questions:

• Was the intent to replace the method taking params string[] errorMessages or should it have remain and delegate to the new method?

• Is a similar change needed on all the others? (NotFound, Unauthorized, etc.)?

[ardalis]

Probably both methods should still exist (single string as well as string array) and yeah probably across the board. If you have time do you want to create an issue for this and perhaps a PR?