pub fn generate_entropy_mnemonic(word_count: Option<WordCount>) -> MnemonicExpand description
Generates a random BIP 39 mnemonic with the specified word count.
If no word count is specified, defaults to 24 words (256-bit entropy).
The result may be used to initialize the Node entropy, i.e., can be given to
Builder::set_entropy_bip39_mnemonic.