refactor: simplified wallet setup

[sarvalabs-harshrastogi]

Simplified Wallet Setup and Initialization

This pull request introduces significant enhancements to the js-moi-wallet module, simplifying the wallet setup and initialization APIs for a more user-friendly experience.

Changes

The following key changes have been implemented:

• constructor: Now, a Wallet instance is created using the private key, serving as both the creation and initialization step.

• Wallet.fromMnemonic: Enables the creation of a wallet using a mnemonic and a specified path.

• Wallet.fromMnemonicSync: Synchronously creates a wallet using a mnemonic and a path.

• Wallet.fromKeystore: Allows the creation of a wallet instance using a provided keystore and password.

• Wallet.createRandom: Introduces a method to create a wallet instance using a randomly generated mnemonic.

• Wallet.createRandomSync: Provides a synchronous alternative for creating a wallet instance with a randomly generated mnemonic.

These changes collectively simplify the wallet setup process and contribute to a more intuitive and streamlined API structure.

• closes #51

Changes include

• [ ] Bugfix (non-breaking change that solves an issue)
• [X] New feature (non-breaking change that adds functionality)
• [x] Breaking change (change that is not backwards-compatible and/or changes current functionality)

Checklist

• [X] I have assigned this PR to myself
• [X] I have added at least 1 reviewer
• [X] I have tested this code
• [X] I have updated the README and other relevant documents (guides...)

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