feat: add cspell schema, ignore code blocks

[josefaidt]

Issue #, if available:

Description of changes:

• adds JSON schema for cspell
• adds regex to ignore inline and fenced code blocks

This will remove the large list of ignored words in cspell.json that are typically added for fenced code block examples, and enable autocomplete in the config with the provided schema

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.