feat: improve component event handler type

[ota-meshi]

Related to sveltejs/eslint-plugin-svelte#432

This PR improves assigning the correct event handler type when the component type is available.

However, since @typescript-eslint/parser cannot be used to retrieve component types, users should use the experimental parser typescript-eslint-parser-for-extra-files instead. .
If the user is using @typescript-eslint/parser it will be the same as before.

[coveralls]

Pull Request Test Coverage Report for Build 4749304045

• 6 of 6 (100.0%) changed or added relevant lines in 1 file are covered.
• 12 unchanged lines in 2 files lost coverage.
• Overall coverage decreased (-0.08%) to 90.631%

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Files with Coverage Reduction	New Missed Lines	%
src/parser/converts/common.ts	1	94.74%
src/parser/converts/element.ts	11	92.8%

Totals
Change from base Build 4643414505:	-0.08%
Covered Lines:	2095
Relevant Lines:	2235

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💛 - Coveralls