feat: extract endpoint

[AbigailDeng]

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[github-actions]

🔴 Total coverage is lower than the default branch

Lines	Branches	Functions	Statements
99.04% (-0.37%)	97.54% (-1.31%)	99.07% (+0.05%)	99.08% (-0.36%)

Detailed report

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	File	Lines	Branches	Functions	Statements
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✅	/home/runner/work/aelf-web3.js/aelf-web3.js/src/wallet/index.js	100.00% (+100.00%)	90.90% (+90.90%)	100.00% (+100.00%)	100.00% (+100.00%)