fix(node): support basic auth in blockchain RPC endpoint URLs #5224
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Checklist
Description
This PR adds support for blockchain RPC endpoints that require basic authentication.
It parses credentials from the endpoint URL and sets the appropriate Authorization header for all RPC requests. The header is built using base64 encoding of the username and password in the format
Authorization: Basic {base64(username:password)}. This resolves401 Unauthorizederrors when using providers that require HTTP basic auth. No effect if credentials are not present in the URL.Open API Spec Version Changes (if applicable)
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