Adding mapping to error code 1049 for ErrDatabaseNotFound
errors
#2511
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When a database doesn't exist, MySQL returns error code 1049. This change adds a mapping to error code 1049 for
ErrDatabaseNotFound
errors, and updates our handler so thatComInitDB
messages will map errors to MySQL error codes.This is needed because tooling (e.g. Pomelo EntityFramework MySQL library) can rely on this error code in application logic.
Related to dolthub/dolt#7890