feat: Add Arc support

[dijanin-brat]

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[dijanin-brat]

@codex can you review this PR that adds spport for Arc chain.
Keep in mind that the Arc's native token is USDC and that there are 2 interfaces for it, one as regular ERC20 token that has 6 decimals and the other one when you look at it as a native token (for example for getBalance method) where it has 18 decimals. Focus on the part where those 2 things can cause a problem:

• gas estimations needs to be in 18 decimals
• fills and deposits needs to be in 6 decimals
• for monitor i think that its basically the same thing because we need the balance that we have on a specific address (its important that if we query with getBalance we div it with 18 decimals and if we query for balance with balanceOf then 6 decimals)
• for refiller its the same, we just need to be consistent when toping up something, its not super important if we do it with 18 or 6 decimals

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[chatgpt-codex-connector]

💡 Codex Review

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Reviewed commit: f3ae365c75

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