Add celo fee.estimateFeePerGas

[aaronmgdr]

Overview

This PR introduces custom fee estimation for cases when feeCurrency is used to send a transaction.

Other changes

It also introduces a fallback behaviour of the custom estimation logic.

Tested

• Introduced new unit tests and adapted existing ones.
• Tested for different fee currencies (as well as without it) on alfajores, results below.

Test values from alfajores:

Symbol	maxFeePerGas	maxPriorityFeePerGas
CELO	8000000000n	2000000000n
cREAL	63940958968n	12788191793n
cEUR	11755155930n	2351031186n
cUSD	12672525950n	2534505190n
USDC	12672525950n	2534505190n

Fixes

Fixes #4

[aaronmgdr]

currently wrestling with types. since celo block formatter will format the block to include randomness that is considered required by this function. even though its not used.

my thought is its better to only included the properties that are used in the function as required but im not sure how to modify these types are they are quite complex.

Types of property 'block' are incompatible.
 Property 'randomness' is missing in type '{ number: bigint | null; hash: `0x${string}` | null; nonce: `0x${string}` | null; size: bigint; logsBloom: `0x${string}` | null; baseFeePerGas: bigint | null; blobGasUsed: bigint; difficulty: bigint; ... 17 more ...; transactions: `0x${string}`[] | ({ ...; } | ... 2 more ... | { ...; })[]; }' but required in type '{ number: bigint | null; hash: `0x${string}` | null; nonce: never; size: bigint; logsBloom: `0x${string}` | null; baseFeePerGas: bigint | null; blobGasUsed: bigint; difficulty: never; excessBlobGas: bigint; ... 17 more ...; transactions: `0x${string}`[] | ({ ...; } | ... 12 more ... | { ...; })[]; }'.

[github-actions[bot]]

size-limit report 📦

Path	Size	Loading time (3g)	Running time (snapdragon)	Total time
viem (esm)	66.42 KB (+0.02% 🔺)	1.4 s (+0.02% 🔺)	4.7 s (+62.44% 🔺)	6 s
viem (cjs)	86.28 KB (+0.02% 🔺)	1.8 s (+0.02% 🔺)	9.7 s (+55.22% 🔺)	11.4 s
viem (minimal surface - tree-shaking)	3.73 KB (0%)	75 ms (0%)	61 ms (-4.89% 🔽)	136 ms
viem/accounts	91.47 KB (0%)	1.9 s (0%)	898 ms (-36.09% 🔽)	2.8 s
viem/accounts (tree-shaking)	21.09 KB (0%)	422 ms (0%)	815 ms (-23.26% 🔽)	1.3 s
viem/actions	46.67 KB (0%)	934 ms (0%)	1.2 s (-45.81% 🔽)	2.2 s
viem/actions (tree-shaking)	340 B (0%)	10 ms (0%)	32 ms (+23.95% 🔺)	42 ms
viem/chains	30.87 KB (+0.46% 🔺)	618 ms (+0.46% 🔺)	1.6 s (+2.94% 🔺)	2.2 s
viem/chains (tree-shaking)	367 B (0%)	10 ms (0%)	31 ms (+19.53% 🔺)	41 ms
viem/chains/utils	1.16 KB (0%)	24 ms (0%)	34 ms (-2.77% 🔽)	57 ms
viem/ens	46.67 KB (0%)	934 ms (0%)	1.6 s (+38.65% 🔺)	2.5 s
viem/ens (tree-shaking)	20.69 KB (0%)	414 ms (0%)	436 ms (-74.86% 🔽)	849 ms

[aaronmgdr]

I would say merge this into the celo/viem main branch and then open a pr from that to viem main