Custom tags

[Mesoptier]

This PR allows users to specify their own tags.

Example:

return interpolateComponents({
    mixedString: '<<link>>text<</link>>',
    components: {
        link: <a href="#" />,
    },
    tags: {
        componentOpen: ['<<', '>>'],
        componentClose: ['<</', '>>'],
        componentSelfClosing: ['<<', '/>>'],
    },
});