Use ethers.js V6 and simplify functions #1

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tornadocontrib wants to merge 5 commits from tornadocontrib/tornado-oracles:simple into main
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@ -1,6 +1,6 @@
{
"name": "@tornado/tornado-oracles",
"version": "3.3.0",
"version": "4.0.0",
"description": "Oracles for Tornado-specific transactions & actions",
"main": "./lib/index.js",
"types": "./lib/index.d.ts",