Emit click event on button enter or space keydown

[MaxKless]

fixes #242
@bendera here is the PR we discussed :)

[bendera]

Thanks! I love to see how the contributors' list grows. :)

How come it's a plain event and not a mouse (pointer?) event? I didn't write it to be argumentative, I just want to understand.

[MaxKless]

No reason... Event is just the base that I've always used in Lit and I'm not sure what the reasons or consequences of using MouseEvent would be. So idk :P I can update it if you want

[MaxKless]

I changed the event to be a MouseEvent because that's probably more in line with what consumers will be expecting.

[bendera]

Thanks!

I don't want to publish a new release yet, but I've published a pre-release version on npm. So you can use it if you'd like.

npm i @vscode-elements/elements@next

[MaxKless]

Awesome, I'll pull it down :) Thanks!