chore: Update cspell and fix issues

- covert `cSpell.json` to `cspell.config.yaml`
- break up the word list into multiple dictionary files
- fix spelling issues
- Enable spell checking code for non-test files

docs/syntax/flowchart.md

@@ -1200,3 +1200,5 @@ mermaid.flowchartConfig = {
     width: 100%
 }
 ```
+
+<!--- cspell:ignore lagom --->