scanner: reject duplicate BIP21 parameter keys (#63) - #151
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In src/modules/scanner/implementation.rs, decode_onchain() parsed BIP21 URI parameters by collecting them directly into a HashMap<String, String>.
Per BIP-0021 specification, duplicate parameter keys in a URI make the URI invalid. Collecting into a HashMap directly silently dropped earlier duplicate keys, overwriting them with the last key-value pair.
This PR updates query parameter parsing to check for duplicate keys, returning DecodingError::InvalidFormat if duplicate parameter keys are present.
Fixes #63
Testing