[BUG] Any non supported schema format should not make the doc invalid

[smoya]

Describe the bug.

Current supported schema formats are available in https://www.asyncapi.com/docs/reference/specification/v3.0.0#multiFormatSchemaObject.

If we try to parse a document containing an schema with, for example, schemaFormat: "application/octet-stream", the parser gives a validation error: Unknown schema format.

E.g.

Error thrown during AsyncAPI document parsing. Name: Error, message: Unknown schema format, stack: Error: Unknown schema format\n'

However, we find the following statement in the spec (same link as above):

Custom values are allowed but their implementation is OPTIONAL.

Expected behavior

Even though no custom schema parser is found for a given schema format, the document should still be valid as long as it is a string

Screenshots

How to Reproduce

import { Parser } from "@asyncapi/parser";
const parser = new Parser();
const { document, diagnostics } = await parser.parse(`
asyncapi: 3.0.0
info:
  title: Test custom schema format
  version: 0.1.0
components:
  schemas:
    theSchema:
      schemaFormat: application/octet-stream # This is allowed by the spec
      schema: true
`);

if (document) {
  console.log(document.info().title());
} else {
  console.log(diagnostics);
}

🥦 Browser

None

👀 Have you checked for similar open issues?

• I checked and didn't find similar issue

🏢 Have you read the Contributing Guidelines?

• I have read the Contributing Guidelines

Are you willing to work on this issue ?

None