Add more test coverage of `RESPTranslator`

Nathan Harrisrequested to merge
more-resptranslator-tests into master

Motivation:

Diagnostics for why .bulkString parses might fail were weak, and edge cases fell through gaps in coverage were found.

Modifications:

Added new cases to RESPTranslator.ParsingError for .bulkString parsing with additional test coverage.

Result:

Users should have better diagnostics for bogus data or failed parsing state.

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