Support SASL Security Scheme types

[conor-ward]

Reason/Context

Please try answering few of those questions

• Why we need this improvement?
  • SASL security scheme are supported in AsyncAPI 2.1.0 and later. For interacting with Kafka services it is useful to have SASL supported in this library also.
• How will this change help?
  • It will allow users to document their authentication type

Description

Please try answering few of those questions

• What changes have to be introduced?
  • I think adding the necessary SASL types to the SecurityScheme enum. I'm not sure what else would be needed.
• Will this be a breaking change?
  • It shouldn't be as it is adding types

I'm not sure if this is possible as the AsyncAPI version supported in this library is 2.0.0 so I'm not sure if updating this to allow 2.1.0 or later would mean having to add more functionality than just adding SASL to the Security Schemes. So this Issue/Feature Request could be a lot bigger than just adding a Security Scheme.

[github-actions]

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[github-actions]

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[Pakisan]

@conor-ward implemented in 2.6.0 draft

#126