Fluent-validation

Resolve issue with rulesets not cascading correctly to Inheritance Validators (1754)

Add backwards compatibility overloads for validator registration methods.

Optional internal type registration should work with MVC registration (1748)

Display name generation should be consistent between RuleForEach and RuleFor.ForEach (1231)
Allow AddFluentValidation to be called directly on IServiceCollection (1726)
Throw exception on ValidateAndThrow even if PreValidate prevents further Validation (1736)
ValidationException now includes rule severity (1733)
Optionally support internal types when scanning assemblies for validators (1742)
Deprecate RunDefaultMvcValidationAfterFluentValidationExecutes in MVC configuration. Use DisableDataAnnotationsValidation instead.

Allow default severity level to be set globally (1715)
Extend use of variance into the internal API to resolve invalid cast exceptions in some scenarios (1711)
Fix clientside metadata being incorrectly generated for cross-property LessThanOrEqual/GreaterThanOrEqual (1721)

Fix a bug where async conditions were sometimes run synchronously.