feat: Added the block-lang rule

[marekdedic]

Closes #380

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[ota-meshi]

Thank you for this PR!
I haven't had time to check this yet, but let me comment on the rule name.

In *.vue, <script> and <style> tags are called block.
https://vuejs.org/api/sfc-spec.html#overview
But it's probably not called block in *.svelte.

So I think it probably makes more sense to rename the rule.
What do you think about naming it lang-attribute for example?

[marekdedic]

Hi,
you'll get to it when you'll get to it, no pressure.

Actually, they're referred to as blocks in the svelte docs:

• https://svelte.dev/docs#component-format-script
• https://svelte.dev/docs#component-format-style

But I'm open to renaming it :)

[ota-meshi]

Oh! Thank you! I didn't know that.
Thanks to the information you gave me, I had second thoughts that the name block-lang made the most sense.

[ota-meshi]

LGTM! Thank you very much!