feat: improve completion handling with quote support and scalar detection

[kddejong]

• Add quote detection and handling in CompletionUtils
• Add scalar node type detection for better syntax tree parsing
• Simplify intrinsic function completion providers by using context parameter
• Improve JSON parsing with incremental parsing support
• Add comprehensive tests for quote handling in completions

Issue #, if available:

Description of changes:

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[Zee2413]

Please rebase before merge.

[github-actions]

Package	Line Rate	Branch Rate	Complexity	Health
ai	22%	80%	0	❌
ai.llm	53%	80%	0	❌
app	0%	0%	0	❌
artifacts	100%	100%	0	✔
auth	87%	92%	0	✔
autocomplete	93%	91%	0	✔
context	95%	95%	0	✔
context.semantic	98%	97%	0	✔
context.semantic.parameter	100%	95%	0	✔
context.syntaxtree	89%	90%	0	✔
context.syntaxtree.utils	86%	91%	0	✔
datastore	77%	97%	0	❌
definition	100%	100%	0	✔
document	93%	96%	0	✔
documentSymbol	93%	81%	0	✔
handlers	74%	87%	0	❌
hover	85%	86%	0	➖
protocol	96%	100%	0	✔
resourceState	75%	79%	0	❌
schema	88%	87%	0	✔
schema.transformers	83%	84%	0	➖
server	97%	96%	0	✔
services	66%	89%	0	❌
services.cfnLint	72%	91%	0	❌
services.guard	95%	79%	0	✔
services.guard.assets	81%	77%	0	➖
settings	97%	87%	0	✔
stacks	100%	100%	0	✔
telemetry	58%	78%	0	❌
templates	89%	84%	0	✔
utils	91%	92%	0	✔
Summary	86% (16721 / 19433)	89% (3445 / 3871)	0	✔