Feature: Copy button for module in schema tab

[manazoid]

Refer to issue: https://github.com/edgedb/edgedb/issues/8157

Version of EdgeDB CLI: Gel CLI 6.2.0-dev.1232+e1eee9f

There's should be export or copy button for full module

for example here I can not copy all and share to my team. It's strange

[jquesada2016]

#394 is related to this.