Feature request: Add support for manipulating schemas generation via ISchemaFilter

[stephanruhland]

Describe the issue It would be nice to allow to implement custom logic to manipulate the generation of operations and schemas, similarly to what Swashbuckle provides: Extend Generator with Operation, Schema & Document Filters

Example use cases

• Extend the schema when not using DataAnnotations but a different form of validation (e.g. the popular FluentValidation)
• Change the handling of request or response types (like enums) via ISchemaFilter

This feature is a successor of feature request #376 after the support of IDocumentFilter where implemented.

[morrisonbrett]

Would be so great if @justinyoo could take a look at this, please.

[mathiasi]

This functionality would be useful for us since we want to migrate from in-process to isolated process and we had the ability with Swashbuckle previously

[Hackmancoltaire]

+1