Wallet / Provider discovery support

[jdevcs]

Add support of CLI command line flag and also add question in CLI tool to user for selection of wallet discovery in generated UI DApp template.

• old approach window.ethereum or
• EIP6963.

EIP-6963 is recommended over window.ethereum for discovering and interacting with multiple injected EIP-1193 providers, as it provides a more robust and standardized approach to avoid race conditions and conflicts between multiple wallet providers in same browser.

• Test
• documentation

Code snippets in :

• Angular templates
• React templates