feat: optimize governance positions

[guibescos]

Merge positions is called for OIS in claim rewards, but it's never called in the context of Pyth Governance, I want to do it when you try to stake more tokens.

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Name	Status	Preview	Comments	Updated (UTC)
api-reference	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Oct 3, 2024 5:18pm
staking	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Oct 3, 2024 5:18pm

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| Name | Status | Preview | Comments | Updated (UTC) | | :--- | :----- | :------ | :------- | :------ | | **proposals** | ⬜️ Ignored ([Inspect](https://vercel.com/pyth-network/proposals/ByEsUzmTfQ8KPJsobucW7WULgcMw)) | [Visit Preview](https://proposals-git-feat-optimize-governance-positions-pyth-network.vercel.app) | | Oct 3, 2024 5:18pm |