Provide stack icon for Apache Camel stack

[apupier]

it will avoid to have the generic square

[apupier]

@eivantsov Do you know how to handle it? Where are the images provided?

I see

community-stacks/hadoop/hadoop-stack.json

Line 49 in b4719e5

"name": "type-hadoop.svg",

but where the file type-hadoop.svg mentioned comes from?