scripts: add script that broadcasts tx to lots of servers
scripts: add script that broadcasts tx to lots of servers

useful when trying to RBF a tx that did not opt-in to RBF

pooler/electrum-ltc,spesmilo/electrum,pooler/electrum-ltc,wakiyamap/electrum-mona,spesmilo/electrum,wakiyamap/electrum-mona,pooler/electrum-ltc,pooler/electrum-ltc,wakiyamap/electrum-mona,wakiyamap/electrum-mona,spesmilo/electrum,spesmilo/electrum