feat: implement subscribe/unsubscribe methods for multiple event handlers

[Avcharov]

Motivation and Context

Fixes issue: #551

How Has This Been Tested?

unit tests, useHostStyles implementation check in basic react example

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation update

[pkg-pr-new]

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@modelcontextprotocol/ext-apps

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@modelcontextprotocol/server-basic-preact

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@modelcontextprotocol/server-basic-react

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@modelcontextprotocol/server-basic-solid

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@modelcontextprotocol/server-basic-svelte

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@modelcontextprotocol/server-basic-vanillajs

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@modelcontextprotocol/server-basic-vue

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@modelcontextprotocol/server-budget-allocator

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@modelcontextprotocol/server-cohort-heatmap

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@modelcontextprotocol/server-customer-segmentation

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@modelcontextprotocol/server-debug

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@modelcontextprotocol/server-map

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@modelcontextprotocol/server-pdf

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@modelcontextprotocol/server-scenario-modeler

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@modelcontextprotocol/server-shadertoy

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@modelcontextprotocol/server-sheet-music

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@modelcontextprotocol/server-system-monitor

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@modelcontextprotocol/server-threejs

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@modelcontextprotocol/server-transcript

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@modelcontextprotocol/server-video-resource

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@modelcontextprotocol/server-wiki-explorer

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commit: e483398