Use loading pattern

[MaggieKimani1]

This PR is an implementation of the loading design proposed as part of this conversation: #1446 (comment) which seeks to resolve the issue highlighted in #1434

It involves:

• Creating a static factory for loading/parsing any OpenAPI model object that implements the Load/LoadAsync/Parse pattern as per this implementation https://learn.microsoft.com/en-us/dotnet/api/system.xml.linq.xdocument.load?view=net-7.0
• Introducing static Load/LoadAsync/Parse methods in the OpenAPI document class to eliminate the discovery issue
• Adding a registry class that allows users to register different OpenAPI format providers and their implementations
• Moves the loading code into the core library so that people who only want to load JSON don't need a dependency on the third party YAML library
• Short-circuits parsing of JSON documents by avoiding the YAML parser.

Fixes #1434
Fixes #1447

[sonarcloud]

Quality Gate failed

Failed conditions
70.3% Coverage on New Code (required ≥ 80%)
13.8% Duplication on New Code (required ≤ 3%)
C Reliability Rating on New Code (required ≥ A)

See analysis details on SonarCloud

Catch issues before they fail your Quality Gate with our IDE extension SonarLint

[darrelmiller]

I think this PR looks good. I want have a conversation about having a Load method that doesn't require you to say what the format is, but we can defer that to conversation to after this PR has been merged..

[sonarcloud]

Quality Gate failed

Failed conditions
26.0% Coverage on New Code (required ≥ 80%)
15.5% Duplication on New Code (required ≤ 3%)
C Reliability Rating on New Code (required ≥ A)

See analysis details on SonarCloud

Catch issues before they fail your Quality Gate with our IDE extension SonarLint