[RPC / Websocket] - Way to add CORS allowlist so we can allow all or specific website to directly connect.

[maestroi]

New issue checklist

• I have read all of the README
• I have searched existing issues and this is not a duplicate.

General information

• Library version(s): -
• Browser version(s): -
• Devices/Simulators/Machine affected: -
• Reproducible in the testnet? (Yes/No): Yes
• Related issues: -

Nimiq 0.20.0+

Bug report

Expected behavior

I would expect to connect a browser directly to websocket/rpc interface with nimiq but thats not possible due to blocking in CORS, there is currently no way to add cors allowlist to all for example.

Actual behavior

Blocked by cors in browser.

Steps to reproduce

Connect via website to a rpc node directly.

Crash log? Screenshots? Videos? Sample project?

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Question or Feature Request

Add support in config to add CORS allowlist.