Delete old name resolution, rewrite prepared statements

[max-hoffman]

• Swap name resolution, fill gaps (many error tests with different names and other small tweaks).
• Rewrite prepared statements to cache a sqlparser.ParsedQuery, whose GenerateQuery method converts a map of bindvars to a new query string. Caching the output of name resolution failed for many ORDER BY 1 clauses and compound expressions like SUM(x)+1. I don't think the better strategy is too far away, but better to not overcomplicate this right now.
• I stripped many of the auxiliary prepared tests, keeping the core ones. The new prepare strategy is pretty simple, but I can add the other prepared tests back in if we want. I would probably structure them all in a different way.
• The old parse.go tests are kept but disabled right now. I want to convert them to use the new name resolution, but the only thing I would be keeping are the query strings.
• Started to delete some of the old code. More to do.

Working on Dolt bump. Some parse.go helper methods are used in strange ways, and still need to get tests working.