Hoist error prettifier rule construction

[Sean-Kenneth-Doherty]

Summary

• build the regex/replacer rule list once per prettifier instead of once per diagnostic message
• keep the formatter output path unchanged while removing repeated Promise/rule/closure allocation during diagnostic refreshes

Refs #139.

Tests

• npm run -w @pretty-ts-errors/utils build
• npm run -w @pretty-ts-errors/formatter lint
• npm run -w @pretty-ts-errors/formatter test
• npm run -w @pretty-ts-errors/formatter build
• npx prettier --check packages/formatter/src/errorMessagePrettifier.ts

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[yoavbls]

Thank you!