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feat(rules): add prefer-query-decorators rule (#238)

* feat(rules): add prefer-query-decorators rule

Lit provides @query, @queryAll, @queryAssignedElements, and
@queryAssignedNodes decorators specifically to replace manual
shadowRoot/renderRoot DOM queries. Without this rule, developers
may habitually reach for this.shadowRoot.querySelector() not
realising the idiomatic decorator pattern exists, leading to
verbose, scattered query logic instead of declarative class
fields that co-locate element access with the class definition.

* chore: rework some eslint 9 things and type casts

* chore: switch to maps

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Co-authored-by: James Garbutt <43081j@users.noreply.github.com>

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