refactor(language-core): generate the type of slots with function property

[KazariEX]

Reference https://typescript-eslint.io/rules/method-signature-style.

It will allow us to perform more strict type checks on slots.

[pkg-pr-new]

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vue-component-meta

npm i https://pkg.pr.new/vuejs/language-tools/vue-component-meta@5173

@vue/language-plugin-pug

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vue-component-type-helpers

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@vue/language-server

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@vue/language-service

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@vue/language-core

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vue-tsc

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@vue/typescript-plugin

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commit: 74354d5