Support mapping/hashing of more common data types

[chadlwilson]

Context / Goal

Initial support for mapping common column data types (as supported by R2DBC)

Expected Outcome

• Figure out what base data types across DBs we should have support for
  • Include mapping to Java time/data types (LocalDate, LocalDateTime, DateTime etc)
  • R2DBC drivers for various DBs would need to already support mapping these types to a Java type; or we'd to add mappers
  • If we decide not to directly support a type, we may need to document for users how their queries should be written to co-erce simpler types to one that is supported (e.g numeric or string)
  • May want to start by reviewing, say, the R2DBC Postgres or MySQL drivers and looking at what types they produce
• Extend HashedRow to know how to hash these types

Out of Scope

Additional context / implementation notes