fix: gaslimit

[hugomrdias]

Fixed gasLimit estimation in estimateMessageGas and signMessage by using gasEstimateMessageGas method directly instead of calling gasEstimateGasLimitwhich failed saying it didnt exist.

[BeroBurny]

The build is failing because of manifest mismatch, for easy fix you can

• from the root folder run yarn run manifest
• inside the package execute this mm-snap manifest in nterminal

[cloudflare-pages[bot]]

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Branch Preview URL:	https://fix-gas-limit.filsnap.pages.dev

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[hugomrdias]

ty @BeroBurny, the cmd is actually yarn build but i got it working and fixed the test should be ready for review.