MI-317: Truncate and warn when prefixed resource names exceed AWS limits

[toddhainsworth]

Description of the proposed changes

• Replaces the synthesis error thrown when a prefixed resource name exceeds the AWS maximum length with automatic truncation — the aspect now truncates the name and appends an 8-character SHA-256 hash to maintain uniqueness
• Emits a cdk synth warning (via Annotations.of(node).addWarning()) for each truncated resource, identifying the original and truncated name so users can shorten their prefix or base name if desired
• Adds a truncateToFit private method that handles suffix-aware truncation (preserving .fifo for FIFO queues/topics); validateResourceName now only handles S3 structural checks (uppercase, underscores)
• Adds four new tests covering: warning emission, deterministic output, FIFO suffix preservation, and no-truncation for short names
• Documents the truncation behaviour and ResourcePrefixAspect usage in the package README

Notes to reviewers

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[crispy101]

LGTM

[kai-nguyen-aligent]

Nice one, @toddhainsworth 🚀