feat: ignore elements with a vite-ignore or wxt-ignore attribute

[Tensai75]

Overview

This PR adds the ability for the user to use ignore attributes, either vite-ignore or wxt-ignore in html elements to make wxt ignore those elements and not process the src or href attributes.
If wxt-ignore is used as attribute, the attribute is removed. The vite-ignore attribute does not need to be removed as it is removed later by Vite.

Manual Testing

Add the attribute vite-ignore or wxt-ignore to a link element in an entrypoint html file. The href attribute should not be processed in the resulting html file and the vite-ignore or wxt-ignore should be removed.

Related Issue

N/A.
Manually ignoring elements may be beneficial in some specific edge cases like in the problem which was discussed here: #1548

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[Tensai75]

Will add new separate PRs for the wxt-ignore attribute and the {{packageVersion}} as template variable.