mathlib
                                
                                
                                
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                        refactor(module/submodule): allow submodules to be used for sub-distrib_mul_actions
- [x] depends on: #6648
 
note that this only deals with submonoids closed under smul, not subgroups closed under smul; I know one of @kbuzzard's students is working on the latter.
This is getting stuck on some timeouts in hahn_banach
My student wrote some wholly non-mathlib-ready code and I think they're done.
This PR/issue depends on:
- ~~leanprover-community/mathlib#6648~~ By Dependent Issues (🤖). Happy coding!