feat: Add fixes for block-lang rule

[Winter]

I wanted eslint to automatically fix script/style errors from the block-lang rule.

The lang fixes will only apply when a script/style config value contains only a single, non-null value.

<!-- svelte/block-lang: ["error", {"enforceScriptPresent": true}] -->
<!-- Error: The <script> block should be present and its lang attribute should be omitted -->

<!-- fixes into at the top of the file --> 
<script>
</script>

<!-- svelte/block-lang: ["error", {"enforceScriptPresent": true, "script": "ts"}] -->
<!-- Error: The <script> block should be present and its lang attribute should be "ts" -->

<!-- fixes into at the top of the file --> 
<script lang="ts">
</script>

<!-- svelte/block-lang: ["error", {"script": "ts"}] -->
<!-- Error: The lang attribute of the <script> block should be "ts"-->

<script>
</script>
<!-- fixes into --> 
<script lang="ts">
</script>

<!-- svelte/block-lang: ["error", {"script": "ts"}] -->
<!-- Error: The lang attribute of the <script> block should be "ts"-->

<script context="module">
</script>
<!-- fixes into --> 
<script lang="ts" context="module">
</script>

<!-- svelte/block-lang: ["error", {"script": "ts"}] -->
<!-- Error: The lang attribute of the <script> block should be "ts" -->

<script module>
</script>
<!-- fixes into --> 
<script lang="ts" module>
</script>

The same logic applies to the style tag except will create at the bottom of the file

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Latest commit: 937acbc

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[ota-meshi]

Thank you for this PR!

I think changing the lang attribute may break the component.
Auto-fix needs to be safe, so could you change it to use the suggestions API instead?
If multiple langs ​​are allowed, we could show multiple suggestions.