Prepare to support Multi Format Schemas

[tvahrst]

Components Object now holds a map of <String, ComponentSchema> instead of <String, SchemaObject>.

ComponentSchema is a Container for either SchemaObject, SchemaReference or MultiFormatSchema.

This is a preparation to support other schema formats than asyncapi-schema, (for instance openapi-schema).

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[timonback]

Hi @tvahrst, we like the direction of the contribution.

We have two questions that might be best answered via a face-to-face call:

1. Have you thought about using ComponentSchema everywhere and thereby replacing SchemaObject? So that we do not need to check if it is a, then do §1, otherwise if it is b, then do §2. Eventhought the spec does allow for flexibility, we can restrict/simplify it for our needs.
2. So far we haven't written many comments. And would like to understand in which situation which comments would have helped.