feat: add core mainnet

[Reinis-FRP]

Fixes https://linear.app/uma/issue/UMA-2392/add-core-to-osnapsafesnap-plugins-in-snapshot

Changes in this PR: adds Core mainnet to both oSnap and safeSnap plugins

There are still couple of outstanding issues for adding Core support:

• Safe app links in both oSnap/safeSnap tx builder does not work as Core Safe app instance does not support safe externally
• Transaction builder is not able to automatically fetch contract ABI since Core chain explorer requires API key to fetch that.
• Transaction builder fails to load token/NFT balances for Core as Covalent service does not support Core network: https://www.covalenthq.com/docs/networks/

How to test and review this PR?

Fixes: https://linear.app/uma/issue/UMA-2410/point-cordao-treasury-links-to-coredao-safe-app

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Name	Status	Preview	Comments	Updated (UTC)
snapshot	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Feb 20, 2024 8:48pm
snapshot-goerli	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Feb 20, 2024 8:48pm

[linear]

UMA-2392 Add core to oSnap/safeSnap plugins in Snapshot

[daywiss]

looks good. dont merge, i will need to pr this to snapshot eventually. i dont think theres a huge rush unless this is blocking your dev

[linear]

UMA-2410 point cordao treasury links to coredao safe app

[daywiss]

prd here snapshot-labs/snapshot-v1#4575