fix(plugin-vue): allow disabling hmr template caching (#8)

[argetsky]

Description

This PR fixes HMR not working as expected when Vue script and template are in separate files (as described in #8) by allowing to disable template caching in HMR through plugin options.

Additional context

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What is the purpose of this pull request?

• Bug fix
• New Feature
• Documentation update
• Other

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• Read the Contributing Guidelines.
• Read the Pull Request Guidelines and follow the PR Title Convention.
• Check that there isn't already a PR that solves the problem the same way to avoid creating a duplicate.
• Provide a description in this PR that addresses what the PR is solving, or reference the issue that it solves (e.g. fixes #123).
• Ideally, include relevant tests that fail without this PR but pass with it.

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[edison1105]

#8 is a duplicate of #7.
#7 (comment)