feat: custom derivation paths in Mnemonic ECDSA private key derivation

[bguiz]

Description:

What

• Add custom derivation path capability

Why

• Compatibility/ parity with EVM dev tools + wallets. Specifically:
  • When working Metamask, you need to use the hardcoded derivation path in it, and in SDK there's also a (different) hardcoded derivation path.
  • In EVM dev tools - web3.js/ethers.js/viem etc - they allow you to specify a custom derivation path, and do not force you to use the Ethereum one.
• The lack of support for custom derivation paths is a friction point for EVM developers onboarding into Hedera development
  • This may have the effect of effectively discouraging use of the SDK, in favour of using 3rd party libraries that do support custom derivation paths
• we should aim to reduce the reliance on 3rd party dependencies in general, within code that is written using the SDK
  • The following examples demonstrate that (1) additional code is needed, and (2) additional 3rd party dependencies need to be brought in:
  • example of extra code required in JS: https://github.com/hedera-dev/scratch-hello-world/blob/60fa4007/js-hello-world/00-create-fund-account/script-create-fund-account.js#L19-L23
  • example of extra code required in Java: https://github.com/hedera-dev/scratch-hello-world/blob/60fa4007/java-hello-world/00-create-fund-account/src/main/java/createfundaccount/ScriptCreateFundAccount.java#L30-L55
  • example of extra code required in Go: https://github.com/hedera-dev/scratch-hello-world/blob/60fa4007/golang-hello-world/00-create-fund-account/script-create-fund-account.go#L37-L61

Related issue(s):

Fixes: hiero-ledger/hiero-sdk-java#1263 (comment)

Notes for reviewer:

• Related: chore: update java version of examples hedera-dev/scratch-hello-world#1
• Discussion with @thenswan + @0xivanov: https://swirldslabs.slack.com/archives/C0453UVBR42/p1717898573711519?thread_ts=1717061977.081859&cid=C0453UVBR42
• Related: feat: custom derivation paths in Mnemonic ECDSA private key derivation hiero-sdk-java#1842
• Related: feat: custom derivation paths in Mnemonic ECDSA private key derivation hiero-sdk-js#2341

Checklist

• Documented (Code comments, README, etc.)
• Tested (unit, integration, etc.)

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
No data about Coverage
0.0% Duplication on New Code

See analysis details on SonarCloud

[0xivanov]

Overall Looks good, will take a closer look next week and will include this in the next release probably.

[bguiz]

Overall Looks good, will take a closer look next week and will include this in the next release probably.

Thanks!