Log BLS public keys and producer public keys on startup/shutdown

[heifner]

Currently signature-provider in Non-default options log are completely masked out:

info  2024-08-01T18:03:24.494 nodeos.be main.cpp:62                   log_non_default_opti ] Non-default options: data-dir = spring-testnet4-data2, config-dir = spring-testnet4, plugin = eosio::chain_api_plugin, genesis-json = spring-testnet4/genesis.json, chain-state-db-size-mb = 32000, database-map-mode = mapped_private, http-server-address = 127.0.0.1:8899, p2p-listen-endpoint = 0.0.0.0:9899:0, signature-provider = ***, signature-provider = ***, producer-name = zombiezombie, p2p-peer-address = p2p.spring-beta4.jungletestnet.io:9898

Would be handy to log the public key portion. Something like:

signature-provider = PUB_BLS_MEiD85FQ_7-WMBno5xit7-kHcCaJak7UVtcFQayDfneJCQT1mleNd-FQ9kBRHL4A_kHg41rEjhHXlfiH0GWqB2PP6mRUBR_wiFwOsO8lKUtDa_mBjtGSUVIo2sQWKDMGjEGASA=KEY:***
signature-provider = EOS7GQpG7KWgw7FaFDnkua1LadP71nF1kVqAXZ5uD8apE3gUoCxX4=KEY:***