Remove broken external oracle and fixed EIP-1559 gasPrice calculation

* Updated 1inch Oracle link and use multicall3 ( because this is the only contract supported on sepolia )
* Simplify EIP-1559 gasPrice calculation ( EIP-1559 removes necessity of using external oracles, just enough premium of basefee will ensure transaction being mined )
* Apply respective premium for fees ( Only applied on V6 Oracle class )
* Removed @tornado/gas-price-oracle oracle

src/feeOracleV6.ts

@@ -19,11 +19,14 @@ import { TornadoFeeOracleV5 } from './feeOracleV5';
  */
 export class TornadoFeeOracleV6 extends TornadoFeeOracle implements ITornadoFeeOracle {
   private fallbackFeeOracle: TornadoFeeOracleV5;
+  // Override value for BSC (Since old relayers use static value of 3.3 gwei)
+  public overrideGasPrice?: GasPriceParams;
 
-  public constructor(chainId: number, rpcUrl: string) {
+  public constructor(chainId: number, rpcUrl: string, overrideGasPrice?: GasPriceParams) {
     super(6, chainId, rpcUrl);
 
     this.fallbackFeeOracle = new TornadoFeeOracleV5(chainId, rpcUrl);
+    this.overrideGasPrice = overrideGasPrice;
   }
 
   /**
@@ -46,6 +49,9 @@ export class TornadoFeeOracleV6 extends TornadoFeeOracle implements ITornadoFeeO
    * (Can spike 12.5% per block accoring to the EIP-1559 metrics https://metamask.io/1559/)
    */
   async getGasPriceParams(speed?: LegacyGasPriceKey, bumpPercent?: number): Promise<GasPriceParams> {
+    if (this.overrideGasPrice) {
+      return this.overrideGasPrice;
+    }
     if (typeof bumpPercent === 'undefined') {
       bumpPercent = this.chainId === ChainId.BSC ? undefined : 30;
     }