feat(utxo-lib): standardize secp256k1 cryptography implementation

[OttoAllmendinger]

This PR standardizes our cryptographic implementations by replacing various
implementations with the official @bitgo/secp256k1 library:

• Replace utxo-lib bip32 functionality with direct imports from
  @bitgo/secp256k1 in abstract-utxo module
• Replace internal noble_ecc wrapper with direct imports from
  @bitgo/secp256k1 in utxo-lib
• Use ECPair instead of custom @noble/secp256k1 implementation for signing
  operations

These changes maintain backward compatibility while consolidating our
cryptographic operations on a single library.

Issue: BTC-2668

[Copilot]

Pull Request Overview

This PR standardizes cryptographic implementations by replacing various secp256k1 libraries with the official @bitgo/secp256k1 library. The changes consolidate cryptographic operations on a single library while maintaining backward compatibility.

• Replaces imports from bip32, ecpair, and @noble/secp256k1 with @bitgo/secp256k1
• Removes the internal noble_ecc wrapper module completely
• Updates package dependencies to use @bitgo/secp256k1 across modules

Reviewed Changes

Copilot reviewed 49 out of 49 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
modules/utxo-lib/src/noble_ecc.ts	Removes entire internal wrapper module
modules/utxo-lib/src/index.ts	Updates exports to use @bitgo/secp256k1 with deprecation warnings
modules/utxo-lib/package.json	Updates dependencies to use @bitgo/secp256k1
modules/secp256k1/src/index.ts	Adds missing ECPairFactory and BIP32Factory exports
modules/abstract-utxo/*	Updates imports to use @bitgo/secp256k1 directly
modules/utxo-core/*	Updates imports to use @bitgo/secp256k1 directly

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