Add Metabase's additional parameters

[SebastianSchoeps]

This PR adds the possibility to use Metabase's additional parameters:

• bordered
• titled
• theme

Currently those are hard-coded.

bordered currently defaults to true. I would prefer to default this to false so that you don't have to actually disable it in the blade component:

<x-metabase dashboard="1" :params="$params" :bordered="false"></x-metabase>

Enabling would be easy:

<x-metabase dashboard="1" :params="$params" bordered></x-metabase>

I have left it like before so that this PR is not breaking.

[uyab]

I agree with false as default value for "bordered" params. It is ok if we have breaking changes, still in early version :)

[SebastianSchoeps]

I changed the default value - ready to merge! :-)

[uyab]

Thank your for your contribution