[DQL] Switching to a new Inlay engine

[dorian-krefft-dt]

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[Copilot]

Pull request overview

Switches DQL parameter inlay hints to the newer IntelliJ InlayHintsProvider engine and introduces PSI support to cache/query defined variables at the query level.

Changes:

• Replaced legacy codeInsight.parameterNameHints provider with codeInsight.inlayProvider and added configurable inlay settings UI.
• Added QueryElement PSI mixin with caching for defined variables; updated variables service to use it.
• Updated bundle messages, grammar, and presentation text to support the new inlay/presentation features.

Reviewed changes

Copilot reviewed 12 out of 12 changed files in this pull request and generated 6 comments.

Show a summary per file

File	Description
src/main/resources/messages/DQLBundle.properties	Adds new UI strings for inlay hint settings and query presentation.
src/main/resources/META-INF/plugin.xml	Switches extension registration to new inlay provider and removes old parameter hints registrations.
src/main/java/pl/thedeem/intellij/dqlpart/DQLPartLanguage.java	Makes DQLPart a kind-of the main DQL language (dialect relationship).
src/main/java/pl/thedeem/intellij/dql/services/variables/DQLVariablesServiceImpl.java	Updates variable discovery to use query-level cached variables.
src/main/java/pl/thedeem/intellij/dql/services/variables/DQLVariablesService.java	Tightens nullability contract for getDefaultVariablesFile.
src/main/java/pl/thedeem/intellij/dql/psi/elements/impl/VariableElementImpl.java	Changes variable value resolution behavior when definition is not JSON-backed.
src/main/java/pl/thedeem/intellij/dql/psi/elements/impl/QueryElementImpl.java	Adds cached computation of defined variables and query presentation.
src/main/java/pl/thedeem/intellij/dql/psi/elements/QueryElement.java	Introduces PSI API for query-defined variables.
src/main/java/pl/thedeem/intellij/dql/highlighting/hints/DQLParameterNameHintsProvider.java	New inlay hints provider implementation + settings UI + preview text.
src/main/grammar/dql.bnf	Adds mixin/implements for query PSI element.
CHANGELOG.md	Documents the switch to the new inlay provider/settings location.

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