fix: index on `principal_stx_txs` table for faster `/v1/address/{addr}/transactions` lookups#2059

zone117x merged 2 commits intomasterhirosystems/stacks-blockchain-api:masterfrom

fix/principal-stx-txs-idxhirosystems/stacks-blockchain-api:fix/principal-stx-txs-idxCopy head branch name to clipboard