Add invalid key error to Studio

[Mrc0113]

Describe the bug

The error message for an invalid key is vague. It would be ideal if a key did not use required characters [a-zA-Z0-9\.\-_]+$ it should immediately be an error stating invalid key.

I am unsure if this is an issue in the studio itself or the parser.

How to Reproduce

1. Navigate to AsyncAPI Studio w/ default example loaded
2. Replace all "turnOnOff" with "turn On Off"
3. See diagnostics shows 2 errors stating "Referencing in this place is not allowed"

Slack conversation: https://asyncapi.slack.com/archives/C34F2JV0U/p1688058753622989

Expected behavior

It would be ideal if a key did not use required characters [a-zA-Z0-9\.\-_]+$ it should immediately be an error stating invalid key.

[github-actions]

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[Amzani]

@Mrc0113 not related to studio, a new rule should be added to spectral, I've created an issue here: stoplightio/spectral#2503

[Mrc0113]

Thank you @Amzani

[github-actions]

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