Improve originalInput property

[jonaslagoni]

Reason/Context

Right now the originalInput property in the MetaModel is a relic that over-served its purpose in its current form.

Here are the current problems with it:

• It's impossible to determine the type of the input that builds the model. I.e. it could be an AsyncAPI Schema, or Avro, the only way to know is for each time you access it determine it by interpretation.
• If you do end up interpreting the value it's near impossible to know the type as it's all internal in Modelina without having any rules on what it may be.

These two problems make it hard to use the values when needed in the presets.

Ideally, any important values should be part of the MetaModels, but the originalInput should always be there as a backup for users. It should also be possible for users to extend the originalInput types to custom ones in order to support that users can create their own models from scratch.

Therefore I propose we change this in the next major version as this will be a breaking change.

[github-actions]

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