Refactor: Update Hierarchical Deterministic Key Derivation

[teddyjfpender]

Refactor: Update Hierarchical Deterministic Key Derivation

This pull request introduces improvements to the key derivation process in the context of Hierarchical Deterministic (HD) wallets. With the new modifications, the key derivation process could support multiple accounts, which is a crucial feature for users wishing to manage more than one account. The update also uses the defined hardened derivation paths.

The changes introduced in this PR are as follows:

• Updated the deriveKeyPair function to accept an optional accountNumber parameter. If no account number is provided, the function defaults to account 0 (see vault.ts and hd.ts). This allows the key derivation process to generate keys for different accounts.

• Added a new test to ensure that the deriveKeyPair function generates different keys for different account numbers (see hd.test.ts).

• Updated the getHierarchicalDeterministicPath function to accept a MinaHDPath object which holds information about the account index, change, and index for generating the BIP44 path (see hd.ts).

• Introduced the MinaHDPath, MinaKeyConst, and MinaPathLevelIndexes interfaces and constants in types.ts to facilitate HD path generation.

• Refactored test cases to align with these changes (see hd.test.ts and vault.test.ts).

Have a look at the proposed changes; I appreciate any feedback or questions you may have 😄

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