Add exclusions and per-symbol suppression

[Perdolique]

Summary

Add explicit controls for files and declarations that are valid external or dynamic entry points.

Motivation

A language server can report references from the current project graph, but it cannot prove that a named export, framework hook, reflected member, or serialized property has no external consumer. Users need a durable way to keep these declarations out of Zero Reference results.

Scope

• Add zeroReference.exclude as workspace-relative glob patterns for declaration files that should not be analyzed.
• Add a configurable set of eligible symbol kinds while preserving the current defaults initially.
• Add an option to ignore exported TypeScript and JavaScript declarations; determine export status without brittle text matching.
• Support // zero-reference-ignore-next-line for a single declaration.
• Provide an Ignore this symbol code action or equivalent native action that inserts the suppression comment.
• Apply exclusions and suppression before reference lookups whenever possible.
• Document that results describe the current workspace reference graph, not external or dynamic consumers.

Acceptance criteria

• Excluded files and suppressed declarations perform no reference lookup and produce no CodeLens, inlay hint, or diagnostic.
• Globs are evaluated consistently in single-root and multi-root workspaces.
• The exported-declaration option covers named exports, export lists, and default declarations in TypeScript and JavaScript.
• Existing users retain the current result set unless they enable a new filter.
• Invalid configuration is reported in the output channel while the extension continues with a safe fallback.
• Tests cover exclusions, every suppression placement, exported declarations, and configuration refresh.

Out of scope

• Automatic suppression based on a framework name.
• Automatic removal of ignored code.