Add support to directly add MessageEmbeds to Paginator #103

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Description

The paginator, while nice to use, is limited in how much you can customize it.
In fact, other than changing, if the page number should be shown in the footer, the color and the actual description itself is the Paginator not that customizable, considering it using embeds.

My suggestion is to implement support, to directly provide MessageEmbed(s) through a addItems(MessageEmbed...) method.

Why do I not implement it?
The current code of the Paginator is way too strict and complicated, as that it would allow to directly add MessageEmbeds without an entire recode (Unless you guys know a proper way).
I wanted to implement it myself, but it's just way too much and would result on an entire recode on my end, which is not what I want to achieve here, as this would also be a difficult part in a PR.