feat: module circuit breaker

[tac0turtle]

Description

add circuit breaker module

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[julienrbrt]

We need an extra message that can be only called by an authority (so for gov) for allowing to define admins (SetPermissions).
I wanted to use it on an existing simapp chain, but turns out we can only set admins on genesis.

[alexanderbez]

LGTM. I'd document somewhere on why both the Msg Router and AnteHandler chain both need access to the circuit breaker. Otherwise, LGTM.

[julienrbrt]

It would be nice to precise the granter can be governance as well and that gov is considered as LEVEL_SUPER_ADMIN as well.

[julienrbrt]

We need an extra message that can be only called by an authority (so for gov) for allowing to define admins (SetPermissions). I wanted to use it on an existing simapp chain, but turns out we can only set admins on genesis.

You were right Marko, never mind this comment. I do think a precision in the docs would, however, be useful: #14521 (comment)