Experimental Feature: New ImageBlock for StreamField (Work in Progress)

[Chiemezuo]

This is an experimental feature I'm demoing for my GSoC proposal.
It is a new StreamField block called ImageBlock.
It's a work in progress, but I'd like it to form a basis for my potential conversations about the 'alt text project' with mentors @Stormheg @SaptakS and @thibaudcolas

This is a sample of what the ImageBlock would look like:

And this is what a sample of what it would look like from the console output:

[squash-labs]

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Test this branch here: https://chiemezuofeatureexperimental-i-v7p7b.squash.io