Adds overloads for@EventPattern to allow validation that decorated method signatures match event payload types based on a specified mapping type. Includes tests demonstrating correct usage and error cases with// @ts-expect-error.

PR Checklist

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• The commit message follows our guidelines:https://github.com/nestjs/nest/blob/master/CONTRIBUTING.md
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

PR Type

What kind of change does this PR introduce?

• Bugfix
• Feature
• Code style update (formatting, local variables)
• Refactoring (no functional changes, no api changes)
• Build related changes
• CI related changes
• Other... Please describe:

What is the current behavior?

Issue Number: N/A

What is the new behavior?

Adds overloads to the@EventPattern decorator that creates a static type constraint between the pattern and the decorated method's parameter type.

Example:

typeFooMessage={foo:string;};typeBarMessage={bar:number;};typeEventTypes={'event-pattern-foo':FooMessage;'event-pattern-bar':BarMessage;};classFooBarTestComponent{// correct  @EventPattern<EventTypes>('event-pattern-bar')testBar(event:BarMessage){}// incorrect (foo is specified, but the parameter type is `string` instead of `FooMessage`  @EventPattern<EventTypes>('event-pattern-foo')testFoo(event:string){}}

Does this PR introduce a breaking change?

• Yes
• No

Other information

• I'm unsure of what documentation should be added/where that lives.
• I'm unsure of whether or nottopic is an appropriate name for these overloads instead ofmetadata.