uber-go / mapdecode / 43

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Implement FieldHooks natively in mapstructure

Summary: There needs to be parity between how we parse a struct at
decode time and passing it when applying the DecodeHooks. The simplest
way to do this is to apply field hooks at decode time, and stop piggy-
backing on the DecodeHooks codepath.

In the process of doing this, I also cleaned up the FieldHook API to
only expose the types it will actually use.

Test Plan: tests pass

8 of 8 new or added lines in 2 files covered. (100.0%)

172 of 178 relevant lines covered (96.63%)

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