feat(govdao): emit event on proposal creation to link tx to proposal

[n0izn0iz]

This emit an event at proposal creation to allow tools to link a proposal to the tx that created it. The main goal is to help mitigate ignocent proposals.

[Gno2D2]

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[leohhhn]

What about adding events to all funcs? Vote, CreateProp, ExecuteProp

Makes sense to me, we should do it here

[n0izn0iz]

I wanted to keep this minimal to allow for easy merge without too much debate and unlock us on proposal audit tooling

[zxxma]

I confirm, just wanted to move fast and iterate once minimalism is done. 👌
Short cycles will be easier.

[zivkovicmilos]

I've just left comments on the placement. Waiting on @ajnavarro to confirm 🙏

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[ltzmaxwell]

LGTM.

[leohhhn]

Ok, merging with multiple approvals here to unblock Teritori; let's revisit/add more events in the govdao implementation.