feat(input): add native autocomplete attribute support

[padinko]

Description

Add support for native <input autocomplete=...> attribute. Docs.
This attribute is very necessary to handle autofilling forms (like login/register/address/...)

Markup:

Details

<VaInput
    v-model="form.username"
    :label="t('username')"
    required
    autofocus
    autocomplete="username"
/>

<VaInput
    v-model="form.password"
    type="password"
    :label="t('password')"
    required
    autocomplete="current-password"
/>

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 not work as expected)
• Improvement/refactoring (non-breaking change that doesn't add any feature but make things better)

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[m0ksem]

Thanks!